How to Create a Mirrored Root Pool (Post Installation)

If you did not create a mirrored ZFS root pool during installation, you can easily create one after the installation.

For information about replacing a disk in root pool, see How to Replace a Disk in the ZFS Root Pool.

1. Display your current root pool status.

   # zpool status rpool pool: rpool state: ONLINE scrub: none requested config: NAME STATE READ WRITE CKSUM rpool ONLINE 0 0 0 c1t0d0s0 ONLINE 0 0 0 errors: No known data errors

2. Attach a second disk to configure a mirrored root pool.

   # zpool attach rpool c1t0d0s0 c1t1d0s0 Please be sure to invoke installboot(1M) to make 'c1t1d0s0' bootable. Make sure to wait until resilver is done before rebooting.

3. View the root pool status to confirm that resilvering is complete.

   # zpool status rpool pool: rpool state: ONLINE status: One or more devices is currently being resilvered. The pool will continue to function, possibly in a degraded state. action: Wait for the resilver to complete. scrub: resilver in progress for 0h1m, 24.26% done, 0h3m to go config: NAME STATE READ WRITE CKSUM rpool ONLINE 0 0 0 mirror-0 ONLINE 0 0 0 c1t0d0s0 ONLINE 0 0 0 c1t1d0s0 ONLINE 0 0 0 3.18G resilvered errors: No known data errors

   In the above output, the resilvering process is not complete. Resilvering is complete when you see messages similar to the following:

   scrub: resilver completed after 0h10m with 0 errors on Thu Mar 11 11:27:22 2010

4. Apply boot blocks to the second disk after resilvering is complete.

   sparc# installboot -F zfs /usr/platform/`uname -i`/lib/fs/zfs/bootblk /dev/rdsk/c1t1d0s0

   x86# installgrub /boot/grub/stage1 /boot/grub/stage2 /dev/rdsk/c1t1d0s0

5. Verify that you can boot successfully from the second disk.

6. Set up the system to boot automatically from the new disk, either by using the eeprom command, the setenv command from the SPARC boot PROM. Or, reconfigure the PC BIOS.