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man pages section 8: System Administration Commands

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Updated: Thursday, June 13, 2019
 
 

metastat(8)

Name

metastat - display status for metadevice or hot spare pool

Synopsis

/usr/sbin/metastat -h
/usr/sbin/metastat [-a] [-B] [-D] [-c] [-i] [-p] [-q] 
     [-s setname] [-t] [metadevice...] [hot_spare_pool...]
/usr/sbin/metastat [-a] [-B] [-D] [-c] [-i] [-p] [-q] 
     [-s setname] component...

Description

The metastat command displays the current status for each metadevice (including stripes, concatenations, concatenations of stripes, mirrors, RAID5, soft partitions, and trans devices) or hot spare pool, or of specified metadevices, components, or hot spare pools.

It is helpful to run the metastat command after using the metattach command to view the status of the metadevice.

metastat displays the state of each Solaris Volume Manager RAID-1 volume on the system. The possible states include:

Okay

The device reports no errors.

Needs maintenance

A problem has been detected. This requires that the system administrator replace the failed physical device. Volumes displaying Needs maintenance have incurred no data loss, although additional failures could risk data loss. Take action as quickly as possible.

Last erred

A problem has been detected. Data loss is a possibility. This might occur if a component of a submirror fails and is not replaced by a hot spare, therefore going into Needs maintenance state. If the corresponding component also fails, it would go into Last erred state and, as there is no remaining valid data source, data loss could be a possibility.

Unavailable

A device cannot be accessed, but has not incurred errors. This might occur if a physical device has been removed with Solaris Dynamic Reconfiguration (DR) features, thus leaving the Solaris Volume Manager volume unavailable. It could also occur if an array or disk is powered off at system initialization, or if a >1TB volume is present when the system is booted in 32-bit mode.

After the storage has been made available, run the metastat command with the –i option to update the status of the metadevices. This clears the unavailable state for accessible devices.

Options

The following options are supported:

–a

Display all disk sets. Only metadevices in disk sets that are owned by the current host are displayed.

–B

Display the current status of all of the 64-bit metadevices and hot spares.

–c

Display concise output.

There is one line of output for each metadevice. The output shows the basic structure and the error status, if any, for each metadevice.

The –c output format is distinct from the –p output format. The –p option does not display metadevice status and is not intended as human-readable output.

–D

Display the current status of all of the descriptive name metadevices and hotspares.

–h

Display usage message.

–i

Check the status of RAID-1 (mirror) volumes, RAID-5 volumes, and hot spares. The inquiry checks each metadevice for accessibility, starting at the top level metadevice. When problems are discovered, the metadevice state databases are updated as if an error had occurred.

–p

Display the list of active metadevices and hot spare pools in the same format as md.tab. See md.tab(5).

The –p output is designed for snapshotting the configuration for later recovery or setup.

–q

Display the status for metadevices without the device relocation information.

–s setname

Specify the name of the disk set on which metastat works. Using the –s option causes the command to perform its administrative function within the specified disk set. Without this option, the command performs its function on metadevices and hot spare pools in the local disk set.

–t

Display the current status and timestamp for the specified metadevices and hot spare pools. The timestamp provides the date and time of the last state change.

Operands

The following operands are supported:

component

Display the status of the component hosting a soft partition, including extents, starting blocks, and block count.

hot_spare_pool

Display the status of the specified hot spare pool(s).

metadevice

Display the status of the specified metadevice(s). If a trans metadevice is specified, the status of the master and log devices is also displayed. Trans metadevices have been replaced by UFS logging. See NOTES.

Examples

Example 1 Output Showing Mirror with Two Submirrors

The following example shows the partial output of the metastat command after creating a mirror, opt_mirror, consisting of two submirrors, opt_sub1 and opt_sub2.

# metastat opt_mirror
opt_mirror: Mirror 
    Submirror 0: opt_sub1
      State: Okay
    Submirror 1: opt_sub2
      State: Resyncing
    Resync in progress: 15 % done
    Pass: 1
    Read option: roundrobin (default)
    Write option: parallel (default)
    Size: 2006130 blocks
    .
    .
    .
Example 2 Soft Partition on Mirror with Submirror

The following example shows the partial output of the metastat command after creating a soft partition, d3, on concat d2, which is built on a soft partition.

# metastat
d2: Concat/Stripe
    Size: 204800 blocks
    Stripe 0:
        Device              Start Block  Dbase State        Hot Spare
        d0                         0     No    Okay

d0: Soft Partition
    Component: c0t3d0s0
    Status: Okay
    Size: 204800 blocks
        Extent              Start Block  Block count
             0                      129       204800

d3: Soft Partition
    Component: d2
    Status: Okay
    Size: 202752 blocks
         Extent              Start Block  Block count
              0                      129       202752
Example 3 Trans Metadevice

The following example shows the output of the metastat command after creating a trans metadevice.

# metastat
d2: Concat/Stripe
    Size: 204800 blocks
    Stripe 0:
        Device              Start Block  Dbase State        Hot Spare
        d0                         0     No    Okay

d0: Soft Partition
    Component: c0t3d0s0
    Status: Okay
    Size: 204800 blocks
        Extent              Start Block  Block count
             0                      129       204800

d3: Soft Partition
    Component: d2
    Status: Okay
    Size: 202752 blocks
         Extent              Start Block  Block count
              0                      129       202752
Example 4 Multi-owner disk set

The following example shows the output of the metastat command with a multi-owner disk set and application-based mirror resynchronization option. Application-based resynchronization is set automatically if needed.


# metastat -s oban
oban/d100: Mirror
    Submirror 0: oban/d10
      State: Okay
    Submirror 1: oban/d11
      State: Okay
    Pass: 1
    Read option: roundrobin (default)
    Write option: parallel (default)
    Resync option: application based 
    Owner: None
    Size: 1027216 blocks (501 MB)

oban/d10: Submirror of oban/d100
    State: Okay
    Size: 1027216 blocks (501 MB)
    Stripe 0:
        Device     Start Block  Dbase     State Reloc Hot Spare
        c1t3d0s0          0     No         Okay

oban/d11: Submirror of oban/d100
    State: Okay
    Size: 1027216 blocks (501 MB)
    Stripe 0:
        Device     Start Block  Dbase     State Reloc Hot Spare 
        c1t4d0s0          0     No         Okay

Warnings

metastat displays states as of the time the command is entered. It is unwise to use the output of the metastat -p command to create a md.tab(5) file for a number of reasons:

  • The output of metastat –p might show hot spares being used.

  • It might show mirrors with multiple submirrors. See metainit(8) for instructions for creating multi-way mirrors using metainit and metattach .

  • A slice may go into an error state after metastat –p is issued.

Exit Status

The following exit values are returned:

0

Successful completion.

>0

An error occurred.

Attributes

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE
ATTRIBUTE VALUE
Availability
storage/svm
Interface Stability
Committed

See Also

md(4D), md.cf(5), md.tab(5), md.tab(5), mddb.cf(5), attributes(7), metattach(8), mdmonitord(8), metaclear(8), metadb(8), metadetach(8), metahs(8), metainit(8), metaoffline(8), metaonline(8), metaparam(8), metarecover(8), metarename(8), metareplace(8), metaset(8), metassist(8), metasync(8)

Notes

Trans metadevices have been replaced by UFS logging. Existing trans devices are not logging--they pass data directly through to the underlying device. See mount_ufs(8) for more information about UFS logging.