metaparam(1M) System Administration Commands metaparam(1M)NAMEmetaparam - modify parameters of metadevices
SYNOPSIS
/usr/sbin/metaparam -h
/usr/sbin/metaparam [-s setname]
[concat/stripe or RAID5 options] concat/stripe RAID
/usr/sbin/metaparam [-s setname] [mirror options] mirror
DESCRIPTION
The metaparam command is used to display or modify current parameters
of metadevices.
If just the metadevice is specified as an argument to the metaparam
command, the current settings are displayed.
The metaparam command enables most metadevice (volume) parameters to be
changed. Only the interlace value cannot be changed by metaparam,
because it is established when the metadevice is created and cannot be
changed thereafter.
OPTIONS
Root privileges are required for all of the options.
The following options are supported:
-h
Displays usage message.
-s setname
Specify the name of the diskset on which metaparam 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 metadevices.
CONCAT/STRIPE OR RAID5 OPTIONS
-hhot_spare_pool | none
Specifies the hot spare pool to be used by a metadevice. If none is
specified, the metadevice is disassociated with the hot spare pool
assigned to it. If the metadevice is currently using a hot spare,
then metaparam cannot replace the hot spare pool.
concat/stripe |RAID
Specifies the metadevice name of the concatenation, stripe, or con‐
catenation of stripes, or of the RAID5 metadevice.
MIRROR OPTIONS-r roundrobin | geometric | first
Modifies the read option for a mirror. The -r option must be fol‐
lowed by either roundrobin, geometric, or first. roundrobin, which
is the default action under the metainit command, specifies reading
the disks in a round-robin (load balancing) method. geometric
allows for faster performance on sequential reads. first specifies
reading only from the first submirror.
-w parallel | serial
Modifies the write option for a mirror. The -w option must be fol‐
lowed by either parallel or serial. parallel, the default action
under the metainit command, specifies that all writes are parallel.
serial specifies that all writes are serial.
-p pass_number
A number from 0-to-9 that specifies the order in which a mirror is
resynced during reboot. The default is 1. Smaller pass numbers are
resynced first. Equal pass numbers are run concurrently. If 0 is
used, the mirror resync is skipped. 0 should only be used for mir‐
rors mounted as read-only, or as swap.
mirror
Specifies the metadevice name of the mirror.
EXAMPLES
Example 1 Associating Hot Spare Pool with RAID5 Metadevice
This example associates a hot spare pool, user_pool, with a RAID5
metadevice, user_raid.
# metaparam-h user_pool user_raid
Example 2 Changing Read Option to Geometric
This example changes the read option on a mirror d50 from the default
of roundrobin to geometric.
# metaparam-r geometric d50
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), metahs(1M),
metainit(1M), metaoffline(1M), metaonline(1M), metarecover(1M), metare‐
name(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)SunOS 5.11 26 Mar 2006 metaparam(1M)
