The metasync command starts a resync operation on the specified metadevice. All components that need to be resynced are resynced. If the system crashes during a RAID5 initialization, or during a RAID5 resync, either an initialization or resync restarts when the system reboots.

Applications are free to access a metadevice at the same time that it is being resynced by metasync. Also, metasync performs the copy operations from inside the kernel, which makes the utility more efficient.

Use the -r option in boot scripts to resync all possible submirrors.

-h

Displays usage message.

-r

Specifies that the metasync command handle special resync requirements during a system reboot. metasync -r should only be invoked from /etc/rc2.d/S95svm.sync. The metasync command only resyncs those metadevices that need to be resynced. metasync schedules all the mirror resyncs according to their pass numbers.

As root, you can edit S95svm.sync to specify the -r 2048 option to metasync, so that resync following a reboot occurs as quickly as possible. See the description of buffer_size, below.

-p metadevice

Regenerates parity information for RAID5 metadevices.

-s setname

Specifies the name of the diskset on which metasync will work. Using the -s option will cause the command to perform its administrative function within the specified diskset. Without this option, the command will perform its function on local metadevices.

buffer_size

Specifies the size (number of 512-byte disk blocks) of the internal copy buffer for the mirror resync. The size defaults to 128 512-byte disk blocks (64 Kbytes). It can be no more than 2048 blocks. For best performance (quickest completion of the resync), 2048 blocks is the recommended size.

The following exit values are returned:

0

Successful completion.

>0

An error occurred.

See attributes(5) for descriptions of the following attributes:

metaclear(1M), metadb(1M), metadetach(1M), metahs(1M), metainit(1M), metaoffline(1M), metaonline(1M), metaparam(1M), metareplace(1M), metaroot(1M), metaset(1M), metastat(1M), metattach(1M), md.tab(4), md.cf(4), mddb.cf(4), attributes(5)

Solaris Volume Manager Administration Guide