Search <book_title>...

InfoScale™ 9.0 Storage Foundation Administrator's Guide - Solaris

Last Published: 2025-04-14

Product(s): InfoScale & Storage Foundation (9.0)

Platform: Solaris

Configuring a mirror for the ZFS root pool using a DMP device

After the root pool is in DMP control, you can add any DMP device as a mirror to the ZFS root pool. You can attach or detach the DMP device using the zpool commands.

To replace a disk of root pool, you can use the following procedure to add the new device as a mirror to the ZFS root pool. After the new device is resilvered, you can detach the original device.

The following examples show attaching and detaching the DMP device hitachi_vsp0_00f3s0 to the ZFS root pool.

To configure a mirror for the ZFS root pool using a DMP device.

Make sure the dmp_native_support tunable is set to on.

# vxdmpadm gettune dmp_native_support
Tunable                    Current Value Default Value
-------------------------- ------------- ---------------
dmp_native_support         on            off

If the dmp_native_support tunable is not on, you must enable DMP support for native devices.

View the status of the root pool using the following command:

# zpool status rpool
  pool: rpool
 state: ONLINE
  scan: none requested

config:

        NAME                 STATE     READ WRITE CKSUM
        rpool                ONLINE       0     0     0
        hitachi_vsp0_00f4s0  ONLINE       0     0     0

Use the format command or the fmthard command to format the partition table on the DMP device that you want to add to the root pool. Create the partition the same as the partition of the original device. In this example, the new device hitachi_vsp0_00f3 is formatted to have the similar partitions as the original devicehitachi_vsp0_00f4.

Attach the DMP device hitachi_vsp0_00f3 to the root pool.

# zpool attach rpool hitachi_vsp0_00f4s0 hitachi_vsp0_00f3s0

Make sure to wait until the resilvering operation is completed, before you reboot the system.

# zpool status rpool
  pool: rpool
 state: DEGRADED
status: One or more devices is currently being resilvered. 
        The pool will continue to function in a degraded 
        state.
action: Wait for the resilver to complete.
        Run 'zpool status -v' to see device specific details.
  scan: resilver in progress since Fri Feb  8 05:06:26 2013
    10.6G scanned out of 20.0G at 143M/s, 0h1m to go
    10.6G resilvered, 53.04% done
config:

 NAME                      STATE    READ WRITE CKSUM
   rpool                   DEGRADED    0     0     0
     mirror-0              DEGRADED    0     0     0
       hitachi_vsp0_00f4s0 ONLINE      0     0     0
       hitachi_vsp0_00f3s0 DEGRADED    0     0     0 (resilvering)

For the system to be bootable with the mirror disk, update the eeprom variable boot-device with the paths of the mirrored DMP device.

You can perform these steps while the resilvering is in progress.

If the resilvering operation is completed, then verify booting from mirror disk.

# zpool status rpool
  pool: rpool
 state: ONLINE
  scan: resilvered 20.0G in 0h10m with 0 errors on Wed Mar  
        6 05:02:36 2013
config:
 
 NAME                       STATE   READ WRITE CKSUM
   rpool                    ONLINE     0     0     0
     mirror-0               ONLINE     0     0     0
       hitachi_vsp0_00f4s0  ONLINE     0     0     0
       hitachi_vsp0_00f3s0  ONLINE     0     0     0

Update the ZFS bootloader for the new mirror disk.

# bootadm install-bootloader hitachi_vsp0_00f3s0

# /sbin/installboot -F zfs -f /usr/plaftform/'uname -m' \
/lib/fs/zfs/bootblk /dev/vx/rdmp/hitachi_vsp0_00f3s0