Solaris: Disk Mirroring with DiskSuite

Disk Layout

Keep two slides of 100MB available on each disk for the metadb state replicas.

Duplicate the disk layout

 # prtvtoc /dev/rdsk/cXXdXXdXXs2 | fmthard –s - /dev/rdsk/cYYdYYtYYs2

Create the metadb replicas

Use the following commands to create the replicas on each disk.

# metadb –a –f –c 2 /dev/rdsk/cXXdXXtXXsX
# metadb –a –c 2 /dev/rdsk/cYYdYYtYYsY

Setup a mirror of a filesystem that can be umounted

 # umount /your_fs
 # metainit d10 1 1 cXXdXXtXXsX
 # metainit d20 1 1 cYYdYYtYYsX
 # metainit –m d30 d10
 # metattach d30 d20

Use “metastat” to verify when the disk syncing completed. Update “/etc/vfstab” to the new created mirror “/dev/md/(r)dsk/d01 and remount the filesystem.

 # mount /your_fs

Setup a mirror of a filesystem that can not be umounted

 # metainit –f d11 1 1 cXXdXXtXXsX
 # metainit d21 1 1 cYYdYYtYYsY
 # metainit –m d02 d11

Update “/etc/vfstab” to the new created mirror “/dev/md/(r)dsk/d02 and reboot the system.
After the system is rebooted attach the second sub-mirror.

 # metattach d31 d21

Use metastat to verify the syncing, don’t reboot the system until the syncing completed.

Setup a mirror of the swapspace

See “Setup a mirror of a filesystem that can not be umounted”

Setup a mirror of the root file system

 # metainit d12 1 1 root_device
 # metainit d22 cYYdYYtYYsY
 # metainit –m d33 d12
 # metaroot d03

The metaroot command will update /etc/vfstab, verify that “/” is set to the new created mirror. Sync the filesystems and reboot the system.

 # sync; sync # reboot

When the system is rebooted attach the second submirror

 # metattach d33 d22

Crashdump device

Update your crashdump device to the mirrored swap device.

 # dumpadm -d swap