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Oracle® Automatic Storage Management Administrator's Guide
12c Release 1 (12.1)

E17612-20
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ASMCMD Disk Group Management Commands

This section describes the ASMCMD disk group management commands.

Table 10-34 provides a summary of the disk group management commands.

Table 10-34 Summary of ASMCMD Disk group management commands

Command Description

chdg

Changes a disk group (add, drop, or rebalance).

chkdg

Checks or repairs a disk group.

dropdg

Drops a disk group.

iostat

Displays I/O statistics for disks.

lsattr

Lists the attributes of a disk group.

lsdg

Lists disk groups and their information.

lsdsk

Lists disks Oracle ASM disks.

lsod

Lists open devices.

md_backup

Creates a backup of the metadata of mounted disk groups.

md_restore

Restores disk groups from a backup of the metadata.

mkdg

Creates a disk group.

mount

Mounts a disk group.

offline

Offlines a disk or a failure group.

online

Onlines a disk or a failure group.

rebal

Rebalances a disk group.

remap

Relocates data in a range of physical blocks on a disk.

setattr

Sets attributes in a disk group.

umount

Dismounts a disk group.


chdg

Purpose

Changes a disk group (adds disks, drops disks, resizes disks, or rebalances a disk group) based on an XML configuration file.

Syntax and Description


chdg { config_file.xml | 'contents_of_xml_file' }

Table 10-35 lists the syntax options for the chdg command.

Table 10-35 Options for the chdg command

Option Description

config_file

Name of the XML file that contains the changes for the disk group. chdg searches for the XML file in the directory where ASMCMD was started unless a path is specified.

For examples of the valid tags and XML configuration file, see Example 10-40 and Example 10-41.

contents_of_xml_file

The XML script enclosed in single quotations.


chdg modifies a disk group based on an XML configuration file. The modification includes adding, replacing, or deleting disks from an existing disk group, and the setting rebalance or replace power level. The power level can be set to the same values as the ASM_POWER_LIMIT initialization parameter. For information about the initialization parameter, see "ASM_POWER_LIMIT".

When adding disks to a disk group, the diskstring must be specified in a format similar to the ASM_DISKSTRING initialization parameter. For information about the initialization parameter, see "ASM_DISKSTRING".

The failure groups are optional parameters. The default causes every disk to belong to a its own failure group. For information about failure groups, see"Oracle ASM Failure Groups".

Dropping disks from a disk group can be performed through this operation. An individual disk can be referenced by its Oracle ASM disk name. A set of disks that belong to a failure group can be specified by the failure group name. For information about dropping disks, see"Dropping Disks from Disk Groups".

You can resize a disk inside a disk group with chdg. The resize operation fails if there is not enough space for storing data after the resize. For information about resizing disks, see"Resizing Disks in Disk Groups".

Example 10-40 shows the basic structure and the valid tags with their respective attributes for the chdg XML configuration file.

Example 10-40 Tags for the chdg XML configuration template

<chdg> update disk clause (add/delete disks/failure groups)
      name         disk group to change
      power        power to perform rebalance or replace
 
<add>  items to add are placed here
</add>

<replace>  items to replace are placed here
</replace>

<drop> items to drop are placed here
</drop>

<fg>  failure group
      name         failure group name
</fg>

<dsk> disk
      name         disk name
      string       disk path
      size         size of the disk to add
      force        true specifies to use the force option
</dsk>

</chdg>

For information about creating a disk group with ASMCMD mkdg, see "mkdg". For information about altering disk groups, see "Altering Disk Groups".

Example

The following is an example of an XML configuration file for chdg. This XML file alters the disk group named data. The failure group fg1 is dropped and the disk data_0001 is also dropped. The /dev/disk5 disk is added to failure group fg2. The rebalance power level is set to 3.

Example 10-41 chdg sample XML configuration file

<chdg name="data" power="3">
  <drop>
    <fg name="fg1"></fg>
    <dsk name="data_0001"/>
  </drop>
  <add>
    <fg name="fg2">
      <dsk string="/dev/disk5"/>
    </fg>
  </add>
</chdg>

The following are examples of the chdg command with the configuration file or configuration information on the command line.

Example 10-42 Using the ASMCMD chdg command

ASMCMD [+] > chdg data_config.xml

ASMCMD [+] > chdg '<chdg name="data" power="3">
        <drop><fg name="fg1"></fg><dsk name="data_0001"/></drop>
        <add><fg name="fg2"><dsk string="/dev/disk5"/></fg></add></chdg>'

chkdg

Purpose

Checks or repairs the metadata of a disk group.

Syntax and Description


chkdg [--repair] diskgroup

Table 10-36 lists the syntax options for the chkdg command.

Table 10-36 Options for the chkdg command

Option Description

--repair

Repairs the disk group.

diskgroup

Name of disk group to check or repair.


chkdg checks the metadata of a disk group for errors and optionally repairs the errors.

Example

The following is an example of the chkdg command used to check and repair the data disk group.

Example 10-43 Using the ASMCMD chkdg command

ASMCMD [+] > chkdg --repair data

dropdg

Purpose

Drops a disk group.

Syntax and Description


dropdg [-r [-f]] diskgroup

Table 10-37 lists the syntax options for the dropdg command.

Table 10-37 Options for the dropdg command

Option Description

-f

Force the operation. Only applicable if the disk group cannot be mounted.

-r

Recursive, include contents.

diskgroup

Name of disk group to drop.


dropdg drops an existing disk group. The disk group should not be mounted on multiple nodes.

Example

These are examples of the use of dropdg. The first example forces the drop of the disk group data, including any data in the disk group. The second example drops the disk group fra, including any data in the disk group.

Example 10-44 Using the ASMCMD dropdg command

ASMCMD [+] > dropdg -r -f data

ASMCMD [+] > dropdg -r fra

iostat

Purpose

Displays I/O statistics for Oracle ASM disks in mounted disk groups.

Syntax and Description


iostat [--suppressheader] [-et] [--io] [--region]
        [-G diskgroup] [interval]

iostat lists disk group statistics using the V$ASM_DISK_IOSTAT view.

Table 10-38 lists the syntax options for the iostat command.

Table 10-38 Options for the iostat command

Option Description

-e

Displays error statistics (Read_Err, Write_Err).

-G diskgroup

Displays statistics for the disk group name.

--suppressheader

Suppresses column headings.

--io

Displays information in number of I/Os, instead of bytes.

-t

Displays time statistics (Read_Time, Write_Time).

--region

Displays information for cold and hot disk regions (Cold_Reads, Cold_Writes, Hot_Reads, Hot_Writes).

interval

Refreshes the statistics display based on the interval value (seconds). Use CTRL+C to stop the interval display.


Table 10-39 shows the statistics for a disk group. To view the complete set of statistics for a disk group, use the V$ASM_DISK_IOSTAT view.

Table 10-39 Attribute descriptions for iostat command output

Attribute Name Description

Group_Name

Name of the disk group.

Dsk_Name

Name of the disk.

Reads

Number of bytes read from the disk. If the --io option is entered, then the value is displayed as number of I/Os.

Writes

Number of bytes written to the disk. If the --io option is entered, then the value is displayed as number of I/Os.

Cold_Reads

Number of bytes read from the cold disk region. If the --io option is entered, then the value is displayed as number of I/Os.

Cold_Writes

Number of bytes written from the cold disk region. If the --io option is entered, then the value is displayed as number of I/Os.

Hot_Reads

Number of bytes read from the hot disk region. If the --io option is entered, then the value is displayed as number of I/Os.

Hot_Writes

Number of bytes written to the hot disk region. If the --io option is entered, then the value is displayed as number of I/Os.

Read_Err

Number of failed I/O read requests for the disk.

Write_Err

Number of failed I/O write requests for the disk.

Read_Time

I/O time (in seconds) for read requests for the disk if the TIMED_STATISTICS initialization parameter is set to TRUE (0 if set to FALSE).

Write_Time

I/O time (in seconds) for write requests for the disk if the TIMED_STATISTICS initialization parameter is set to TRUE (0 if set to FALSE).


If a refresh interval is not specified, the number displayed represents the total number of bytes or I/Os. If a refresh interval is specified, then the value displayed (bytes or I/Os) is the difference between the previous and current values, not the total value.

Example

The following are examples of the iostat command. The first example displays disk I/O statistics for the data disk group in total number of bytes. The second example displays disk I/O statistics for the data disk group in total number of I/O operations.

Example 10-45 Using the ASMCMD iostat command

ASMCMD [+] > iostat -G data
Group_Name  Dsk_Name   Reads       Writes     
DATA        DATA_0000  180488192   473707520  
DATA        DATA_0001  1089585152  469538816  
DATA        DATA_0002  191648256   489570304  
DATA        DATA_0003  175724032   424845824  
DATA        DATA_0004  183421952   781429248  
DATA        DATA_0005  1102540800  855269888  
DATA        DATA_0006  171290624   447662592  
DATA        DATA_0007  172281856   361337344  
DATA        DATA_0008  173225472   390840320  
DATA        DATA_0009  288497152   838680576  
DATA        DATA_0010  196657152   375764480  
DATA        DATA_0011  436420096   356003840  

ASMCMD [+] > iostat --io -G data
Group_Name  Dsk_Name   Reads  Writes  
DATA        DATA_0000  2801   34918   
DATA        DATA_0001  58301  35700   
DATA        DATA_0002  3320   36345   
DATA        DATA_0003  2816   10629   
DATA        DATA_0004  2883   34850   
DATA        DATA_0005  59306  38097   
DATA        DATA_0006  2151   10129   
DATA        DATA_0007  2686   10376   
DATA        DATA_0008  2105   8955    
DATA        DATA_0009  9121   36713   
DATA        DATA_0010  3557   8596    
DATA        DATA_0011  17458  9269    

lsattr

Purpose

Lists the attributes of a disk group.

Syntax and Description


lsattr [--suppressheader][-G diskgroup ] [-lm] [pattern]

Table 10-40 lists the syntax options for the lsattr command.

Table 10-40 Options for the lsattr command

Option Description

-G diskgroup

Disk group name.

--suppressheader

Suppresses column headings.

-l

Display names with values.

-m

Displays additional information, such as the RO and Sys columns.

pattern

Display the attributes that contain pattern expression.


Information about disk group attributes is retrieved from the V$ASM_ATTRIBUTE view. For information about disk group attributes, see "Managing Disk Group Attributes".

The RO (read-only) column identifies those attributes that can only be set when a disk group is created. The Sys column identifies those attributes that are system-created.

To display information about the disk group template attributes, see "lstmpl".

To set disk group attributes, see "setattr".

Example

The following are examples of the lsattr command. The first displays information about all attributes for the data disk group. The second example displays only those attributes with names containing the string compat for the fra disk group. Note the use of both the % and * wildcard characters on Linux.

Example 10-46 Using the ASMCMD lsattr command

ASMCMD [+] > lsattr -lm -G data
Group_Name  Name                     Value       RO  Sys  
DATA        access_control.enabled   FALSE       N   Y    
DATA        access_control.umask     066         N   Y    
DATA        au_size                  1048576     Y   Y    
DATA        cell.smart_scan_capable  FALSE       N   N    
DATA        compatible.advm          11.2.0.3.0  N   Y    
DATA        compatible.asm           12.1.0.0.0  N   Y    
DATA        compatible.rdbms         12.1.0.0.0  N   Y    
DATA        content.check            FALSE       N   Y    
DATA        content.type             data        N   Y    
DATA        disk_repair_time         3.6h        N   Y    
DATA        failgroup_repair_time    24.0h       N   Y    
DATA        idp.boundary             auto        N   Y    
DATA        idp.type                 dynamic     N   Y    
DATA        phys_meta_replicated     true        Y   Y    
DATA        sector_size              512         Y   Y    
DATA        thin_provisioned         FALSE       N   Y    

ASMCMD [+] > lsattr -G fra -l %compat*
Name              Value       
compatible.asm    12.1.0.0.0  
compatible.rdbms  11.2.0.3.0  

lsdg

Purpose

Lists mounted disk groups and their information. lsdg queries V$ASM_DISKGROUP_STAT by default. If the --discovery flag is specified, the V$ASM_DISKGROUP is queried instead. The output also includes notification of any current rebalance operation for a disk group. If a disk group is specified, then lsdg returns only information about that disk group.

Syntax and Description

lsdg [--suppressheader] [-g] [--discovery] [pattern]

Table 10-41 lists the options for the lsdg command.

Table 10-41 Options for the lsdg command

Option Description

(none)

Displays the disk group attributes listed in Table 10-42.

--discovery

Selects from V$ASM_DISKGROUP, or from GV$ASM_DISKGROUP if the -g flag is also specified. This option is always enabled if the Oracle ASM instance is version 10.1 or earlier. This flag is disregarded if lsdg is running in non-connected mode.

-g

Selects from GV$ASM_DISKGROUP_STAT, or from GV$ASM_DISKGROUP if the --discovery flag is also specified. GV$ASM_DISKGROUP.INST_ID is included in the output. The REBAL column of the GV$ASM_OPERATION view is also included in the output.

--suppressheader

Suppresses column headings.

pattern

Returns only information about the specified disk group or disk groups that match the supplied pattern. See "Wildcard Characters".


Table 10-42 shows the attributes for each disk group. To view the complete set of attributes for a disk group, use the V$ASM_DISKGROUP_STAT or V$ASM_DISKGROUP view.

See Also:

Oracle Database Reference for descriptions of disk group information displayed in the V$ASM_DISKGROUP view

Table 10-42 Attribute descriptions for lsdg command output

Attribute Name Description

State

State of the disk group. Values include BROKEN, CONNECTED, DISMOUNTED, MOUNTED, QUIESCING, and UNKNOWN.

Type

Disk group redundancy (NORMAL, HIGH, EXTERNAL).

Rebal

Y if a rebalance operation is in progress.

Sector

Sector size in bytes.

Block

Block size in bytes.

AU

Allocation unit size in bytes.

Total_MB

Size of the disk group in megabytes.

Free_MB

Free space in the disk group in megabytes, without regard to redundancy. From the V$ASM_DISKGROUP view.

Req_mir_free_MB

Amount of space that must be available in the disk group to restore full redundancy after the most severe failure that can be tolerated by the disk group. This is the REQUIRED_MIRROR_FREE_MB column from the V$ASM_DISKGROUP view.

Usable_file_MB

Amount of free space, adjusted for mirroring, that is available for new files. From the V$ASM_DISKGROUP view.

Offline_disks

Number of offline disks in the disk group. Offline disks are eventually dropped.

Voting_files

Specifies whether the disk group contains voting files (Y or N).

Name

Disk group name.


Example

The following example lists the attributes of the data disk group.

Example 10-47 Using the ASMCMD lsdg command

ASMCMD [+] > lsdg data
State    Type    Rebal  Sector  Block       AU  Total_MB  Free_MB  Req_mir_free_MB  Usable_file_MB
MOUNTED  NORMAL  N         512   4096  4194304     12288     8835             1117            3859

(continued)
Offline_disks  Voting_files  Name
            0             N  DATA

lsdsk

Purpose

Lists Oracle ASM disks.

Syntax and Description


lsdsk [--suppressheader] [-kptgMI] [-G diskgroup ]
       [ --member|--candidate]
       [--discovery][--statistics][pattern]

Table 10-43 lists the options for the lsdsk command.

Table 10-43 Options for the lsdsk command

Option Description

(none)

Displays the PATH column of the V$ASM_DISK_STAT view.

-k

Displays the TOTAL_MB, FREE_MB, OS_MB,NAME, FAILGROUP, LIBRARY, LABEL, UDID, PRODUCT, REDUNDANCY, and PATH columns of the V$ASM_DISK view.

--statistics

Displays the READS, WRITES, READ_ERRS, WRITE_ERRS, READ_TIME, WRITE_TIME, BYTES_READ, BYTES_WRITTEN, and the PATH columns of the V$ASM_DISK view.

-p

Displays the GROUP_NUMBER, DISK_NUMBER, INCARNATION, MOUNT_STATUS, HEADER_STATUS, MODE_STATUS, STATE, and the PATH columns of the V$ASM_DISK view.

-t

Displays the CREATE_DATE, MOUNT_DATE, REPAIR_TIMER, and the PATH columns of the V$ASM_DISK view.

-g

Selects from GV$ASM_DISK_STAT, or from GV$ASM_DISK if the --discovery flag is also specified. GV$ASM_DISK.INST_ID is included in the output.

--discovery

Selects from V$ASM_DISK, or from GV$ASM_DISK if the -g flag is also specified. This option is always enabled if the Oracle ASM instance is version 10.1 or earlier. This flag is disregarded if lsdsk is running in non-connected mode.

--suppressheader

Suppresses column headings.

-I

Scans disk headers for information rather than extracting the information from an Oracle ASM instance. This option forces non-connected mode.

-G

Restricts results to only those disks that belong to the group specified by diskgroup.

-M

Displays the disks that are visible to some but not all active instances. These are disks that, if included in a disk group, cause the mount of that disk group to fail on the instances where the disks are not visible.

--candidate

Restricts results to only disks having membership status equal to CANDIDATE.

--member

Restricts results to only disks having membership status equal to MEMBER.

pattern

Returns only information about the specified disks that match the supplied pattern.


The lsdsk command can run in connected or non-connected mode. The connected mode is always attempted first. The -I option forces non-connected mode.

  • In connected mode, lsdsk uses the V$ASM_DISK_STAT and V$ASM_DISK dynamic views to retrieve disk information. The V$ASM_DISK_STAT view is used by default.

  • In non-connected mode, lsdsk scans disk headers to retrieve disk information. Some information is not available in this mode and some options are not valid combinations with this mode.

Note:

The non-connected mode is not supported on Windows.

pattern restricts the output to only disks that match the pattern specified. Wild-card characters and slashes (/ or \) can be part of the pattern. pattern should be specified as the last option for the command. For information about wildcards, see "Wildcard Characters".

The -k, -p, -t, and --statistics options modify how much information is displayed for each disk. If any combination of the options are specified, then the output shows the union of the attributes associated with each flag.

Example

The following are examples of the lsdsk command. The first and second examples list information about disks in the data disk group. The third example lists information about candidate disks.

Example 10-48 Using the ASMCMD lsdsk command

ASMCMD [+] > lsdsk -t -G data
Create_Date  Mount_Date  Repair_Timer  Path
13-JUL-09    13-JUL-09   0             /devices/diska1
13-JUL-09    13-JUL-09   0             /devices/diska2
13-JUL-09    13-JUL-09   0             /devices/diska3
13-JUL-09    13-JUL-09   0             /devices/diskb1
13-JUL-09    13-JUL-09   0             /devices/diskb2
13-JUL-09    13-JUL-09   0             /devices/diskb3
13-JUL-09    13-JUL-09   0             /devices/diskc1
13-JUL-09    13-JUL-09   0             /devices/diskc2
...

ASMCMD [+] > lsdsk -p -G data /devices/diska*
Group_Num  Disk_Num      Incarn  Mount_Stat  Header_Stat  Mode_Stat  State   Path
        1         0  2105454210  CACHED      MEMBER       ONLINE     NORMAL  /devices/diska1
        1         1  2105454199  CACHED      MEMBER       ONLINE     NORMAL  /devices/diska2
        1         2  2105454205  CACHED      MEMBER       ONLINE     NORMAL  /devices/diska3

ASMCMD [+] > lsdsk --candidate -p
Group_Num  Disk_Num      Incarn  Mount_Stat  Header_Stat  Mode_Stat  State   Path
        0         5  2105454171  CLOSED      CANDIDATE    ONLINE     NORMAL  /devices/diske1
        0        25  2105454191  CLOSED      CANDIDATE    ONLINE     NORMAL  /devices/diske2
        0        18  2105454184  CLOSED      CANDIDATE    ONLINE     NORMAL  /devices/diske3
        0        31  2105454197  CLOSED      CANDIDATE    ONLINE     NORMAL  /devices/diskk1
        0        21  2105454187  CLOSED      CANDIDATE    ONLINE     NORMAL  /devices/diskk2
        0        26  2105454192  CLOSED      CANDIDATE    ONLINE     NORMAL  /devices/diskk3
        0        14  2105454180  CLOSED      CANDIDATE    ONLINE     NORMAL  /devices/diskl1
...

lsod

Purpose

Lists the open Oracle ASM disks.

Syntax and Description


lsod [--suppressheader] [-G diskgroup] [--process process] [pattern]

Table 10-44 lists the syntax options for the lsod command.

Table 10-44 Options for the lsod command

Option Description

--suppressheader

Suppresses column header information from the output.

-G diskgroup

Specifies the disk group that contains the open disks.

--process process

Specifies a pattern to filter the list of processes.

pattern

Specifies a pattern to filter the list of disks.


The rebalance operation (RBAL) opens a disk both globally and locally so the same disk may be listed twice in the output for the RBAL process.

Example

The following are examples of the lsod command. The first example lists the open devices associated with the data disk group and the LGWR process. The second example lists the open devices associated with the LGWR process for disks that match the diska pattern.

Example 10-49 Using the ASMCMD lsod command

ASMCMD [+] > lsod -G data --process *LGWR*
Instance Process                  OSPID Path
1        oracle@myserver02 (LGWR) 26593 /devices/diska1 
1        oracle@myserver02 (LGWR) 26593 /devices/diska2 
1        oracle@myserver02 (LGWR) 26593 /devices/diska3 
1        oracle@myserver02 (LGWR) 26593 /devices/diskb1 
1        oracle@myserver02 (LGWR) 26593 /devices/diskb2 
1        oracle@myserver02 (LGWR) 26593 /devices/diskb3 
1        oracle@myserver02 (LGWR) 26593 /devices/diskd1 

ASMCMD [+] > lsod --process *LGWR* *diska*
Instance Process                  OSPID Path
1        oracle@myserver02 (LGWR) 26593 /devices/diska1 
1        oracle@myserver02 (LGWR) 26593 /devices/diska2 
1        oracle@myserver02 (LGWR) 26593 /devices/diska3 

For another example of the lsod command, see Example 10-2.

md_backup

Purpose

The md_backup command creates a backup file containing metadata for one or more disk groups.

Syntax and Description


md_backup backup_file
     [-G 'diskgroup [,diskgroup,...]']

Table 10-45 describes the options for the md_backup command.

Table 10-45 Options for the md_backup command

Option Description

backup_file

Specifies the backup file in which you want to store the metadata.

-G diskgroup

Specifies the disk group name of the disk group that must be backed up


By default all the mounted disk groups are included in the backup file, which is saved in the current working directory if a path is not specified with the file name.

Oracle Automatic Storage Management Cluster File System (Oracle ACFS) file system and Oracle ASM Dynamic Volume Manager(Oracle ADVM) volume information is not backed up.

Example

The first example shows the use of the backup command when run without the disk group option. This example backs up all the mounted disk groups and creates the backup image in the /scratch/backup/alldgs20100422 file. The second example creates a backup of the data disk group. The metadata backup that this example creates is saved in the /scratch/backup/data20100422 file.

Example 10-50 Using the ASMCMD md_backup command

ASMCMD [+] > md_backup /scratch/backup/alldgs20100422
Disk group metadata to be backed up: DATA
Disk group metadata to be backed up: FRA
Current alias directory path: ORCL/ONLINELOG
Current alias directory path: ORCL/PARAMETERFILE
Current alias directory path: ORCL
Current alias directory path: ASM
Current alias directory path: ORCL/DATAFILE
Current alias directory path: ORCL/CONTROLFILE
Current alias directory path: ASM/ASMPARAMETERFILE
Current alias directory path: ORCL/TEMPFILE
Current alias directory path: ORCL/ARCHIVELOG/2010_04_20
Current alias directory path: ORCL
Current alias directory path: ORCL/BACKUPSET/2010_04_21
Current alias directory path: ORCL/ARCHIVELOG/2010_04_19
Current alias directory path: ORCL/BACKUPSET/2010_04_22
Current alias directory path: ORCL/ONLINELOG
Current alias directory path: ORCL/BACKUPSET/2010_04_20
Current alias directory path: ORCL/ARCHIVELOG
Current alias directory path: ORCL/BACKUPSET
Current alias directory path: ORCL/ARCHIVELOG/2010_04_22
Current alias directory path: ORCL/DATAFILE
Current alias directory path: ORCL/CONTROLFILE
Current alias directory path: ORCL/ARCHIVELOG/2010_04_21

ASMCMD [+] > md_backup /scratch/backup/data20100422 -G data
Disk group metadata to be backed up: DATA
Current alias directory path: ORCL/ONLINELOG
Current alias directory path: ASM
Current alias directory path: ORCL/CONTROLFILE
Current alias directory path: ASM/ASMPARAMETERFILE
Current alias directory path: ORCL/PARAMETERFILE
Current alias directory path: ORCL
Current alias directory path: ORCL/DATAFILE
Current alias directory path: ORCL/TEMPFILE

md_restore

Purpose

The md_restore command restores disk groups from a metadata backup file.

Syntax and Description


md_restore backup_file [--silent]
     [--full|--nodg|--newdg -o 'old_diskgroup:new_diskgroup [,...]']
     [-S sql_script_file] [-G 'diskgroup [,diskgroup...]']

Table 10-46 describes the options for the md_restore command.

Table 10-46 Options for the md_restore command

Option Description

backup_file

Reads the metadata information from backup_file.

--silent

Ignore errors. Typically, if md_restore encounters an error, it stops. Specifying this flag ignores any errors.

--full

Specifies to create a disk group and restore metadata.

--nodg

Specifies to restore metadata only.

--newdg -o old_diskgroup:new_diskgroup]

Specifies to create a disk group with a different name when restoring metadata. The -o option is required with --newdg.

-S sql_script_file

Write SQL commands to the specified SQL script file instead of executing the commands.

-G diskgroup

Select the disk groups to be restored. If no disk groups are defined, then all disk groups are restored.


Example

The first example restores the disk group data from the backup script and creates a copy. The second example takes an existing disk group data and restores its metadata. The third example restores disk group data completely but the new disk group that is created is named data2. The fourth example restores from the backup file after applying the overrides defined in the override.sql script file.

Example 10-51 Using the ASMCMD md_restore command

ASMCMD [+] > md_restore –-full –G data –-silent /scratch/backup/alldgs20100422

ASMCMD [+] > md_restore –-nodg –G data –-silent /scratch/backup/alldgs20100422

ASMCMD [+] > md_restore –-newdg -o 'data:data2' --silent /scratch/backup/data20100422

ASMCMD [+] > md_restore -S override.sql --silent /scratch/backup/data20100422

mkdg

Purpose

Creates a disk group based on an XML configuration file.

Syntax and Description


mkdg { config_file.xml | 'contents_of_xml_file' }

Table 10-47 lists the syntax options for the mkdg command.

Table 10-47 Options for the mkdg command

Option Description

config_file

Name of the XML file that contains the configuration for the new disk group. mkdg searches for the XML file in the directory where ASMCMD was started unless a path is specified.

For examples of the valid tags and XML configuration file, see Example 10-52 and Example 10-53.

contents_of_xml_file

The XML script enclosed in single quotations.


mkdg creates a new disk group with an XML configuration file that specifies the name of the disk group, redundancy, attributes, and paths of the disks that form the disk group. Redundancy is an optional parameter; the default is normal redundancy. For some types of redundancy, disks are required to be gathered into failure groups. In the case that failure groups are not specified for a disk group, each disk in the disk group belongs to its own failure group.

The mkdg command only mounts a disk group on the local node.

It is possible to set some disk group attribute values during disk group creation. Some attributes, such as AU_SIZE and SECTOR_SIZE, can be set only during disk group creation. For more information about disk groups attributes, refer to "Managing Disk Group Attributes".

The default disk group compatibility settings are 10.1 for Oracle ASM compatibility, 10.1 for database compatibility, and no value for Oracle ADVM compatibility. For information about disk group compatibility attributes, see "Disk Group Compatibility".

Example 10-52 shows the basic structure and the valid tags with their respective attributes for the mkdg XML configuration file.

Example 10-52 Tags for mkdg XML configuration file

<dg>  disk group
      name         disk group name
      redundancy   normal, external, high
 
<fg>  failure group
      name         failure group name
</fg>

<dsk> disk
      name         disk name
      string       disk path
      size         size of the disk to add
      force        true specifies to use the force option
</dsk>

<a>   attribute
      name         attribute name
      value        attribute value
</a>

</dg>

For information about altering a disk group with ASMCMD chdg, see "chdg". For information about creating a disk group, see "Creating Disk Groups".

Example

The following is an example of an XML configuration file for mkdg. The configuration file creates a disk group named data with normal redundancy. Two failure groups, fg1 and fg2, are created, each with two disks identified by associated disk strings. The disk group compatibility attributes are all set to 11.2.

Example 10-53 mkdg sample XML configuration file

<dg name="data" redundancy="normal">
  <fg name="fg1">
    <dsk string="/dev/disk1"/>
    <dsk string="/dev/disk2"/>
  </fg>
  <fg name="fg2">
    <dsk string="/dev/disk3"/>
    <dsk string="/dev/disk4"/>
  </fg>
  <a name="compatible.asm" value="11.2"/>
  <a name="compatible.rdbms" value="11.2"/>
  <a name="compatible.advm" value="11.2"/>
</dg>

The following are examples of the mkdg command. The first example runs mkdg with an XML configuration file in the directory where ASMCMD was started. The second example runs mkdg using information on the command line.

Example 10-54 Using the ASMCMD mkdg command

ASMCMD [+] > mkdg data_config.xml

ASMCMD [+] > mkdg '<dg name="data"><dsk string="/dev/disk*"/></dg>'

mount

Purpose

Mounts a disk group.

Syntax and Description


mount [--restrict] { [-a] | [-f] diskgroup[ diskgroup ...] }

Table 10-48 lists the syntax options for the mount command.

Table 10-48 Options for the mount command

Option Description

diskgroup

Name of the disk group.

-a

Mounts all disk groups.

--restrict

Mounts in restricted mode.

-f

Forces the mount operation.


This operation mounts one or more disk groups. A disk group can be mounted with or without force or restricted options. For more information about mounting disk groups, see "Mounting and Dismounting Disk Groups".

Example

The following are examples of the mount command showing the use of the force, restrict, and all options.

Example 10-55 Using the ASMCMD mount command

ASMCMD [+] > mount -f data

ASMCMD [+] > mount --restrict data

ASMCMD [+] > mount -a

offline

Purpose

Offline disks or failure groups that belong to a disk group.

Syntax and Description


offline -G diskgroup
        { -F failgroup |-D disk}
        [-t {minutes | hours}]

Table 10-49 lists the syntax options for the offline command.

Table 10-49 Options for the offline command

Option Description

-G diskgroup

Disk group name.

-F failgroup

Failure group name.

-D disk

Specifies a single disk name.

-t minutes | hours

Specifies the time before the specified disk is dropped as nm or nh, where m specifies minutes and h specifies hours. For example, 120m or 2h.The default unit is hours.


When a failure group is specified, this implies all the disks that belong to it should be offlined.

Example

The following are examples of the offline command. The first example offlines the failgroup1 failure group of the data disk group. The second example offlines the data_0001 disk of the data disk group with a time of 1.5 hours before the disk is dropped.

Example 10-56 Using the ASMCMD offline command

ASMCMD [+] > offline -G data -F failgroup1

ASMCMD [+] > offline -G data -D data_0001 -t 1.5h

online

Purpose

Online all disks, a single disk, or a failure group that belongs to a disk group.

Syntax and Description


online -G diskgroup { -a | -F failgroup |-D disk} [--power n] [-w]

Table 10-50 lists the syntax options for the online command.

Table 10-50 Options for the online command

Option Description

-a

Online all offline disks in the disk group.

-G diskgroup

Disk group name.

-F failgroup

Failure group name.

-D disk

Disk name.

--power n

Specifies the power option (1 to 1024) which determines the level of resources for the disk resync and disk group rebalance. Larger values result in faster disk resync and disk group rebalance. The default is 1.

-w

Wait option. Causes ASMCMD to wait for the disk group to be rebalanced before returning control to the user. The default is not waiting.


When a failure group is specified, this implies all the disks that belong to it should be onlined.

Example

The following are examples of the online command. The first example onlines all disks in the failgroup1 failure group of the data disk group with the wait option enabled. The second example onlines the data_0001 disk in the data disk group.

Example 10-57 Using the ASMCMD online command

ASMCMD [+] > online -G data -F failgroup1 -w 

ASMCMD [+] > online -G data -D data_0001

rebal

Purpose

Rebalances a disk group.

Syntax and Description


rebal [--power power] [-w] diskgroup

Table 10-51 lists the syntax options for the rebal command.

Table 10-51 Options for the rebal command

Option Description

diskgroup

Disk group name.

--power power

Power setting.

-w

Wait option. Causes ASMCMD to wait for the disk group to be rebalanced before returning control to the user. The default is not waiting.


The power level can be set to the same values as the ASM_POWER_LIMIT initialization parameter. A value of 0 disables rebalancing. If the rebalance power is not specified, the value defaults to the setting of the ASM_POWER_LIMIT initialization parameter. For information about the power level, see "ASM_POWER_LIMIT" and "Tuning Rebalance Operations".

You can determine if a rebalance operation is occurring with the ASMCMD lsop command. See "lsop". For more information about rebalancing a disk group, see "Manually Rebalancing Disk Groups".

Example

The following is an example of the rebal command that rebalances the fra disk group with a power level set to 4.

Example 10-58 Using the ASMCMD rebal command

ASMCMD [+] > rebal --power 4 fra

ASMCMD [+] > lsop
Group_Name  Dsk_Num  State  Power
FRA         REBAL    RUN    4

remap

Purpose

Marks a range of blocks as unusable on the disk and relocates any data allocated in that range.

Syntax and Description

remap diskgroup disk block_range

Table 10-52 lists the syntax options for the remap command.

Table 10-52 Options for the remap command

Option Description

diskgroup

Disk group name in which a disk must have data relocated.

disk

Name of the disk that must have data relocated. The name must match the NAME column in the V$ASM_DISK view.

block_range

Range of physical blocks to relocate in the format start_range_number-end_range_number.


The remap command only relocates blocks. It does not correct or repair blocks that contain corrupted contents. The command uses a physical block size based on the SECTOR_SIZE disk group attribute.

Examples

The first example remaps blocks 5000 through 5999 for disk DATA_0001 in disk group DATA. The second example remaps blocks 6230 through 6339 for disk FRA_0002 in disk group FRA

Example 10-59 Using the ASMCMD remap command

ASMCMD [+] > remap DATA DATA_0001 5000-5999

ASMCMD [+] > remap FRA FRA_0002 6230-6339

setattr

Purpose

Sets the attributes for an Oracle ASM disk group.

Syntax and Description


setattr -G diskgroup attribute_name attribute_value

Table 10-53 lists the syntax options for the setattr command.

Table 10-53 Options for the setattr command

Option Description

-G diskgroup

Disk group name.

attribute_name

Name of the attribute.

attribute_value

Value of the attribute.


The COMPATIBLE.ASM attribute must be advanced before advancing other disk group compatibility attributes and its value must be greater than or equal to the value of other disk group compatibility attributes.

For information about disk group attributes, see "Managing Disk Group Attributes".

Example

The following are examples of the setattr command. The first example sets the disk group attribute COMPATIBLE.ASM to 11.2 for the data disk group. The second example sets the disk group attribute COMPATIBLE.RDBMS to 11.2 for the data disk group.

Example 10-60 Using the ASMCMD setattr command

ASMCMD [+] > setattr -G data compatible.asm 11.2.0.0.0

ASMCMD [+] > setattr -G data compatible.rdbms 11.2.0.0.0

umount

Purpose

Dismounts a disk group.

Syntax and Description


umount { -a | [-f] diskgroup }

Table 10-54 lists the syntax options for the umount command.

Table 10-54 Options for the umount command

Option Description

diskgroup

Name of the disk group.

-a

Dismounts all mounted disk groups. These disk groups are listed in the output of the V$ASM_DISKGROUP view.

-f

Forces the dismount operation.


Example

The following are examples of the umount command. The first example dismounts all disk groups mounted on the Oracle ASM instance. The second example forces the dismount of the data disk group.

Example 10-61 Using the ASMCMD umount command

ASMCMD [+] > umount -a

ASMCMD [+] > umount -f data