15 Managing Oracle ADVM with ASMCMD
Oracle ASM Command-Line Utility (ASMCMD) provides commands for managing Oracle ADVM volumes.
This chapter describes the Oracle Automatic Storage Management (Oracle ASM) Command-Line Utility (ASMCMD) volume management commands.
See Also:
-
Overview of Oracle ASM Dynamic Volume Manager for information about Oracle ASM Dynamic Volume Manager (Oracle ADVM)
-
Managing Oracle ADVM Volumes in a Disk Group for information about using SQL statements to manage Oracle ADVM volumes
-
About ASMCMD for information about using ASMCMD
ASMCMD Volume Management Commands
This topic provides a summary of the Oracle ADVM volume management commands.
Table 15-1 lists the Oracle ADVM volume management commands with brief descriptions. To successfully run these commands, the local Oracle ASM instance must be running and the disk group required by this command must have been created and mounted in the Oracle ASM instance.
Table 15-1 Summary of ASMCMD volume management commands
Command | Description |
---|---|
Creates an Oracle ADVM volume in the specified disk group. |
|
Deletes an Oracle ADVM volume. |
|
Disables Oracle ADVM volumes in mounted disk groups. |
|
Enables Oracle ADVM volumes in mounted disk groups. |
|
Displays information about Oracle ADVM volumes. |
|
Resizes an Oracle ADVM volume. |
|
Sets attributes of an Oracle ADVM volume in mounted disk groups. |
|
Reports volume I/O statistics. |
volcreate
Purpose
Creates an Oracle ADVM volume in the specified disk group.
Syntax and Description
volcreate -G diskgroup -s size [ --column number ] [ --width stripe_width ] [--redundancy {high|mirror|unprotected}] [--primary {hot|cold}] [--secondary {hot|cold}] volume
Table 15-2 describes the options for the volcreate
command.
Table 15-2 Options for the volcreate command
Option | Description |
---|---|
|
Name of the disk group containing the volume. |
|
Size of the volume to be created in units of |
|
Number of columns in a stripe set. Values range from |
|
Stripe width of a volume in units of |
|
Redundancy of the Oracle ADVM volume which can be only specified for normal redundancy disk groups. If redundancy is not specified, the setting defaults to the redundancy level of the disk group and this is the recommended setting. The range of values is as follows: |
|
Data placement specification for primary extents, either |
|
Data placement specification for secondary extents, either |
|
Name of the volume. Only alphanumeric characters and underscores are allowed. Hyphens are not allowed. The first character must be alphabetic. |
WARNING:
Specifying --redundancy
unprotected
means that Oracle ASM mirroring is not available for data recovery with the Oracle ADVM volume. The redundancy setting (normal
) of the disk group does not provide mirroring for an unprotected Oracle ADVM volume. The unprotected
configuration is not recommended for production environments as intermittent storage access failures can result in the loss of data. Backups are strongly recommended.
When creating an Oracle ADVM volume, a volume device name is created with a unique Oracle ADVM persistent disk group number that is concatenated to the end of the volume name. The unique number can be one to three digits.
On Linux, the volume device name is in the format volume_name
-
nnn
, such as volume1-123
. On Windows the volume device name is in the format asm-
volume_name
-
nnn
, such as asm-volume1-123
.
On Linux platforms, the volume name must be less than or equal to eleven alphanumeric characters, starting with an alphabetic character. On AIX platforms, the volume name must be less than or equal to twenty three alphanumeric characters, starting with an alphabetic character. On Windows and Solaris platforms, the volume name must be less than or equal to thirty alphanumeric characters, starting with an alphabetic character.
You can determine the volume device name with the volinfo
command.
If the --column
option is set to 1
, then striping is disabled and the stripe width equals the volume extent size. The volume extent size is 8 MB if the disk group allocation unit (AU) is less than or equal to 8 MB. If the AU size is greater than 8 MB, then the Oracle ADVM volume extent size is equivalent to the disk group AU size. Setting the --column
option to 8 (the default) is recommended to achieve optimal performance with database data files and other files.
A successful volume creation automatically enables the volume device.
The volume device file functions as any other disk or logical volume to mount file systems or for applications to use directly.
When creating an accelerator volume, create the volume on a disk group with storage that is significantly faster than the primary volume's storage.
Before creating an Oracle ADVM volume on AIX, ensure that the necessary user authorizations have been created.
Examples
The following is an example of the volcreate
command that creates volume1
in the data
disk group with the size set to 10 gigabytes.
Example 15-1 Using the ASMCMD volcreate command
ASMCMD [+] > volcreate -G data -s 10G --width 1M --column 8 volume1 ASMCMD [+] > volinfo -G data volume1 Diskgroup Name: DATA Volume Name: VOLUME1 Volume Device: /dev/asm/volume1-123 State: ENABLED Size (MB): 10240 Resize Unit (MB): 64 Redundancy: MIRROR Stripe Columns: 8 Stripe Width (K): 1024 Usage: Mountpath:
See Also:
-
Creating an Oracle ACFS File System for information on mounting the volume device file
-
volinfo for information about the
volinfo
command. -
Limits of Oracle ADVM for information about Oracle ADVM limits
-
mkfs for information about the accelerator volume
-
Mirroring, Redundancy, and Failure Group Options for information about redundancy settings
-
Oracle ACFS Command-Line Tools for the AIX Environment for information about user authorizations on AIX
voldelete
Purpose
Deletes an Oracle ADVM volume.
Syntax and Description
voldelete -G diskgroup volume
Table 15-3 describes the options for the voldelete
command.
Table 15-3 Options for the voldelete command
Option | Description |
---|---|
|
Name of the disk group containing the volume. |
|
Name of the volume. |
To successfully run this command, the local Oracle ASM instance must be running and the disk group required by this command must be mounted in the Oracle ASM instance. Before deleting a volume, you must ensure that there are no active file systems associated with the volume.
Examples
The following is an example of the voldelete
command that deletes volume1
from the data
disk group.
Example 15-2 Using the ASMCMD voldelete command
ASMCMD [+] > voldelete -G data volume1
voldisable
Purpose
Disables Oracle ADVM volumes in mounted disk groups and removes the volume device on the local node.
Syntax and Description
voldisable { --all |{ -G diskgroup { -a | volume } } }
Table 15-4 describes the options for the voldisable
command.
Table 15-4 Options for the voldisable command
Option | Description |
---|---|
|
Specifies all volumes within all disk groups. |
|
Name of the disk group containing the volume. |
|
Specifies all volumes within the specified disk group. |
|
Name of the volume. |
You can disable volumes before shutting down an Oracle ASM instance or dismounting a disk group to verify that the operations can be accomplished normally without including a force option due to open volume files. Disabling a volume also prevents any subsequent opens on the volume or device file because it no longer exists.
Before disabling a volume, you must ensure that there are no active file systems associated with the volume. You must first dismount the Oracle ACFS file system before disabling the volume. Refer to Deregistering, Dismounting, and Disabling Volumes and Oracle ACFS File Systems.
You can delete a volume without first disabling the volume.
Examples
The following is an example of the voldisable
command that disables volume1
in the data
disk group.
Example 15-3 Using the ASMCMD voldisable command
ASMCMD [+] > voldisable -G data volume1
volenable
Purpose
Enables Oracle ADVM volumes in mounted disk groups.
Syntax and Description
volenable { --all |{ -G diskgroup { -a | volume } } }
Table 15-5 describes the options for the volenable
command.
Table 15-5 Options for the volenable command
Option | Description |
---|---|
|
Specifies all volumes within all disk groups. |
|
Name of the disk group containing the volume. |
|
Specifies all volumes within the specified disk group. |
|
Name of the volume. |
A volume is enabled when it is created.
Examples
The following is an example of the volenable
command that enables volume1
in the data
disk group.
Example 15-4 Using the ASMCMD volenable command
ASMCMD [+] > volenable -G data volume1
volinfo
Purpose
Displays information about Oracle ADVM volumes.
Syntax and Description
volinfo { --all |{ -G diskgroup { -a | volume } } } volinfo {--show_diskgroup |--show_volume} volumedevice
Table 15-6 describes the options for the volinfo
command.
Table 15-6 Options for the volinfo command
Option | Description |
---|---|
|
Specifies all volumes within all disk groups. |
|
Name of the disk group containing the volume. |
|
Specifies all volumes within the specified disk group. |
|
Name of the volume. |
|
Returns only the disk group name. A volume device name is required. |
|
Returns only the volume name. A volume device name is required. |
|
Name of the volume device. |
Examples
The first example displays information about the volume1
volume in the data
disk group. This example was produced in a Linux environment. The second example displays information about the volume1
volume in the data
disk group and was produced in a Windows environment.
The Mountpath
field contains the path where the volume is currently mounted or where the volume was last mounted.
Example 15-5 Using the ASMCMD volinfo command
ASMCMD [+] > volinfo -G data volume1 Diskgroup Name: DATA Volume Name: VOLUME1 Volume Device: /dev/asm/volume1-123 State: ENABLED Size (MB): 10240 Resize Unit (MB): 64 Redundancy: MIRROR Stripe Columns: 8 Stripe Width (K): 1024 Usage: ACFS Mountpath: /acfsmounts/acfs1 ASMCMD [+] > volinfo -G data -a Diskgroup Name: DATA Volume Name: VOLUME1 Volume Device: \\.\asm-volume1-311 State: ENABLED Size (MB): 10240 Resize Unit (MB): 64 Redundancy: MIRROR Stripe Columns: 8 Stripe Width (K): 1024 Usage: ACFS Mountpath: C:\oracle\acfsmounts\acfs1
volresize
Purpose
Resizes an Oracle ADVM volume.
Syntax and Description
volresize -G diskgroup -s size [ -f ] volume
Table 15-7 describes the options for the volresize
command.
Table 15-7 Options for the volresize command
Option | Description |
---|---|
|
Name of the disk group containing the volume. |
|
Forces the shrinking of a volume that is not an Oracle ACFS volume and suppresses any warning message. |
|
Name of the volume. |
|
New size of the volume in units of |
If the volume is mounted on a non-Oracle ACFS file system, then dismount the file system first before resizing. If the new size is smaller than current, you are warned of possible data corruption. Unless the -f
(force) option is specified, you are prompted whether to continue with the operation.
If there is an Oracle ACFS file system on the volume, then you cannot resize the volume with the volresize
command. You must use the acfsutil
size
command, which also resizes the volume and file system. For information, see "acfsutil size".
Examples
The following is an example of the volresize
command that resizes volume1
in the data
disk group to 20 gigabytes.
Example 15-6 Using the ASMCMD volresize command
ASMCMD [+] > volresize -G data -s 20G volume1
volset
Purpose
Sets attributes of an Oracle ADVM volume in mounted disk groups.
Syntax and Description
volset -G diskgroup [ --usagestring string] [--mountpath mount_path ] [--primary {hot|cold}] [--secondary {hot|cold}] volume
Table 15-8 describes the options for the volset
command.
Table 15-8 Options for the volset command
Option | Description |
---|---|
|
Name of the disk group containing the volume. |
|
Optional usage string to tag a volume which can be up to 30 characters. This string is set to |
|
Optional string to tag a volume with its mount path string which can be up to 1024 characters. This string is set when the file system is mounted and should not be changed. |
|
Data placement specification for primary extents, either |
|
Data placement specification for secondary extents, either |
|
Name of the volume. |
When running the mkfs
command to create a file system, the usage field is set to ACFS
and mountpath
field is reset to an empty string if it has been set. The usage
field should remain at ACFS
.
When running the mount
command to mount a file system, the mountpath
field is set to the mount path value to identify the mount point for the file system. After the value is set by the mount
command, the mountpath
field should not be updated.
Examples
The following is an example of a volset
command that sets the usage
string for a volume that is not associated with a file system.
Example 15-7 Using the ASMCMD volset command
ASMCMD [+] > volset -G data --usagestring 'no file system created' volume1
volstat
Purpose
Reports I/O statistics for Oracle ADVM volumes.
Syntax and Description
volstat [-G diskgroup] [volume]
Table 15-9 describes the options for the volstat
command.
Table 15-9 Options for the volstat command
Option | Description |
---|---|
|
Name of the mounted disk group containing the volume. |
|
Name of the volume. |
The following apply when using the volstat
command.
-
If the disk group is not specified and the volume name is specified, all mounted disk groups are searched for the specified volume name.
-
If the disk group name is specified and the volume name is omitted, all volumes are displayed for the named disk group.
-
If both the disk group name and the volume name are omitted, all volumes on all disk groups are displayed.
Examples
The following is an example of the volstat
command that displays information about volumes in the data
disk group.
Example 15-8 Using the ASMCMD volstat command
ASMCMD [+] > volstat -G data DISKGROUP NUMBER / NAME: 1 / DATA --------------------------------------- VOLUME_NAME READS BYTES_READ READ_TIME READ_ERRS WRITES BYTES_WRITTEN WRITE_TIME WRITE_ERRS ------------------------------------------------------------- VOLUME1 10085 2290573312 22923 0 1382 5309440 1482 0