metahs(1M) System Administration Commands metahs(1M)NAMEmetahs - manage hot spares and hot spare pools
SYNOPSIS
/usr/sbin/metahs [-s setname] -a all component
/usr/sbin/metahs [-s setname] -a hot_spare_pool [component]
/usr/sbin/metahs [-s setname] -d hot_spare_pool [component]
/usr/sbin/metahs [-s setname] -d all component
/usr/sbin/metahs [-s setname] -e component
/usr/sbin/metahs [-s setname] -r hot_spare_pool component-old
/usr/sbin/metahs [-s setname] -r all component-old component-new
/usr/sbin/metahs [-s setname] -i [hot_spare_pool]...
DESCRIPTION
The metahs command manages existing hot spares and hot spare pools. It
is used to add, delete, enable, and replace components (slices) in hot
spare pools. Like the metainit command, the metahs command can also
create an initial hot spare pool. The metahs command does not replace a
component of a metadevice. This function is performed by the metare‐
place command.
Hot spares are always in one of three states: available, in-use, or
broken. Available hot spares are running and ready to accept data, but
are not currently being written to or read from. In-use hot spares are
currently being written to and read from. Broken hot spares are out of
service and should be repaired. The status of hot spares is displayed
when metahs is invoked with the -i option.
Solaris Volume Manager supports storage devices and logical volumes,
including hot spares, greater than 1 terabyte (TB) when Solaris 10 is
running a 64-bit kernel.
If a system with large volumes or hot spares is rebooted under a 32-bit
Solaris 10 kernel, the large volumes are visible through metastat out‐
put, but they cannot be accessed, modified or deleted, and no new large
volumes can be created. Any volumes or file systems on a large volume
in this situation are also unavailable. If a system with large volumes
is rebooted under a version of Solaris prior to Solaris 10, Solaris
Volume Manager will not start. All large volumes must be removed before
Solaris Volume Manager runs under another version of the Solaris Oper‐
ating Environment.
OPTIONS
Root privileges are required for any of the following options except
-i.
The following options are supported:
-a all component
Add component to all hot spare pools. all is not case sensitive.
-a hot_spare_pool [component]
Add the component to the specified hot_spare_pool. hot_spare_pool
is created if it does not already exist.
-d all component
Delete component from all the hot spare pools. The component cannot
be deleted if it is in the in-use state.
-d hot_spare_pool [component]
Delete hot_spare_pool, if the hot_spare_pool is both empty and not
referenced by a metadevice. If component is specified, it is
deleted from the hot_spare_pool. Hot spares in the in-use state
cannot be deleted.
-e component
Enable component to be available for use as a hot spare. The compo‐
nent can be enabled if it is in the broken state and has been
repaired.
-i [hot_spare_pool...]
Display the status of the specified hot_spare_pool or for all hot
spare pools if one is not specified.
-r all component-old component-new
Replace component-old with component-new in all hot spare pools
which have the component associated. Components cannot be replaced
from any hot spare pool if the old hot spare is in the in-use
state.
-r hot_spare_pool component-old component-new
Replace component-old with component-new in the specified
hot_spare_pool. Components cannot be replaced from a hot spare pool
if the old hot spare is in the in-use state.
-s setname
Specify the name of the diskset on which metahs works. Using the -s
option causes the command to perform its administrative function
within the specified diskset. Without this option, the command per‐
forms its function on local hot spare pools.
OPERANDS
The following operands are supported:
component The logical name for the physical slice (partition)
on a disk drive, such as /dev/dsk/c0t0d0s2.
hot_spare_pool Names for hot spare pools can be any legal file name
that is composed of alphanumeric characters, a dash
("-"), an underscore ("_"), or a period ("."). Names
must begin with a letter. The words "all" and "none"
are reserved and cannot be used.
EXAMPLES
Example 1 Adding a Hot Spare to a Hot Spare Pool
The following example adds a hot spare /dev/dsk/c0t0d0s7 to a hot spare
pool mirror1_pool:
# metahs-a mirror1_pool c0t0d0s7
When the hot spare is added to the pool, the existing order of the hot
spares already in the pool is preserved. The new hot spare is added at
the end of the list of hot spares in the hot spare pool specified.
Example 2 Adding a Hot Spare to All Currently Defined Pools
This example adds a hot spare to the hot spare pools that are currently
defined:
# metahs-a all c0t0d0s7
The keyword all in this example specifies adding the hot spare,
/dev/dsk/c0t0d0s7, to all the hot spare pools.
Example 3 Deleting a Hot Spare
This example deletes a hot spare, /dev/dsk/c0t0d0s7, from a hot spare
pool, hsp003:
# metahs-d hsp003 c0t0d0s7
When you delete a hot spare, the position of the remaining hot spares
in the pool changes to reflect the new order. For instance, if in this
example /dev/dsk/c0t0d0s7 were the second of three hot spares, after
deletion the third hot spare would move to the second position.
Example 4 Replacing a Hot Spare
This example replaces a hot spare that was previously defined:
# metahs-r hsp001 c0t1d0s0 c0t3d0s0
In this example, the hot spare /dev/dsk/c0t1d0s0 is replaced by
/dev/dsk/c0t3d0s0. The order of the hot spares does not change.
EXIT STATUS
The following exit values are returned:
0 Successful completion.
>0 An error occurred.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Availability │storage/svm │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Committed │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOmdmonitord(1M), metaclear(1M), metadb(1M), metadetach(1M),
metainit(1M), metaoffline(1M), metaonline(1M), metaparam(1M), metare‐
cover(1M), metarename(1M), metareplace(1M), metaroot(1M), metaset(1M),
metassist(1M), metastat(1M), metasync(1M), metattach(1M), md.tab(4),
md.cf(4), mddb.cf(4), md.tab(4), attributes(5), md(7D)WARNINGS
Do not create large (>1 TB) volumes if you expect to run the Solaris
Operating Environment with a 32-bit kernel or if you expect to use a
version of the Solaris Operating Environment prior to Solaris 10.
SunOS 5.11 26 Mar 2006 metahs(1M)
