Replace a ZFS Root Pool to another disk
APPLIES TO : Solaris 11.3 LDOM
ISSUE : Server is running in 100GB OS LUN, need to move the OS to another disk provided from another array.
GOAL : Replace a ZFS Root Pool with another disk, Move the OS LUN to the disk provided from another Storage Array
SOLUTION : Attach the secondary disk in zpool, boot the server in both disks, detach the primary disk.
EXAMPLE :
1. Verify the secondary disk c1d1 is visible in format output
root@judi-dev-01:~# echo | format
Searching for disks...done
AVAILABLE DISK SELECTIONS:
0. c1d0 <3PARdata-VV-3212-100.00GB>
/virtual-devices@100/channel-devices@200/disk@0
1. c1d1 <3PARdata-VV-3212-100.00GB>
/virtual-devices@100/channel-devices@200/disk@1
Specify disk (enter its number): Specify disk (enter its number):
root@judi-dev-01:~#
2. Check the zpool list
root@judi-dev-01:~# zpool list
NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT
rpool 99.5G 9.37G 90.1G 9% 1.00x ONLINE -
root@judi-dev-01:~#
3. Check the zpool Status
root@judi-dev-01:~# zpool status
pool: rpool
state: ONLINE
scan: resilvered 7.37G in 30s with 0 errors on Thu Nov 8 11:51:10 2018
config:
NAME STATE READ WRITE CKSUM
rpool ONLINE 0 0 0
c1d0 ONLINE 0 0 0
errors: No known data errors
root@judi-dev-01:~#
4. Verify the bootdisk path (The server booted with disk@0)
root@judi-dev-01:~# prtconf -vp | grep bootpath
bootpath: '/virtual-devices@100/channel-devices@200/disk@0'
root@judi-dev-01:~#
5. Attach the secondary disk c1d1 to zpool
root@judi-dev-01:~# zpool attach rpool c1d0 c1d1
Make sure to wait until resilver is done before rebooting.
root@judi-dev-01:~#
6. Check the status of the pool, Wait till the resilvered completes
root@judi-dev-01:~# zpool status
pool: rpool
state: ONLINE
scan: resilvered 7.37G in 34s with 0 errors on Thu Nov 8 12:34:45 2018
config:
NAME STATE READ WRITE CKSUM
rpool ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
c1d0 ONLINE 0 0 0
c1d1 ONLINE 0 0 0
errors: No known data errors
root@judi-dev-01:~#
7. Apply the boot blocks after the new disk is resilvered
root@judi-dev-01:~# bootadm install-bootloader
root@judi-dev-01:~#
8. Bring down the server to OK Prompt (OBP)
{0} ok show-disks
a) /reboot-memory@0
b) /virtual-devices@100/channel-devices@200/disk@1
c) /virtual-devices@100/channel-devices@200/disk@0
9. Boot the server with secondary disk from OK Prompt (OBP) [Now server is booting with disk@1]
{0} ok boot /virtual-devices@100/channel-devices@200/disk@1
Boot device: /virtual-devices@100/channel-devices@200/disk@1 File and args:
SunOS Release 5.11 Version 11.3 64-bit
Copyright (c) 1983, 2018, Oracle and/or its affiliates. All rights reserved.
Hostname: judi-dev-01
10. Verify the bootdisk path (The server should have booted through the secondary disk disk@1)
root@judi-dev-01:~# prtconf -vp | grep bootpath
bootpath: '/virtual-devices@100/channel-devices@200/disk@1'
root@judi-dev-01:~#
IF YOU FACE ANY ISSUE IN BOOTING THE SERVER IN SECONDARY DISK THEN ROLL BACK THE CHANGE BY BOOTING THE SERVER WITH PRIMARY DISK
/virtual-devices@100/channel-devices@200/disk@0
FOLLOW THE BELOW PROCEDURE IF YOU THE SERVER BOOTS IN SECONDARY DISK WITHOUT ANY ISSUE.
11. Check the zpool Status
root@judi-dev-01:~# zpool status
pool: rpool
state: ONLINE
scan: resilvered 7.37G in 34s with 0 errors on Thu Nov 8 12:34:45 2018
config:
NAME STATE READ WRITE CKSUM
rpool ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
c1d0 ONLINE 0 0 0
c1d1 ONLINE 0 0 0
errors: No known data errors
root@judi-dev-01:~#
12. Detach the old(primary) disk c1d0 from the pool, since the server is booting without any issue from the secondary disk.
root@judi-dev-01:~# zpool detach rpool c1d0
root@judi-dev-01:~#
13. Check the status of the zpool, the zpool contains only the secondary disk
root@judi-dev-01:~# zpool status
pool: rpool
state: ONLINE
scan: resilvered 7.37G in 34s with 0 errors on Thu Nov 8 12:34:45 2018
config:
NAME STATE READ WRITE CKSUM
rpool ONLINE 0 0 0
c1d1 ONLINE 0 0 0
errors: No known data errors
root@judi-dev-01:~#
14. reboot the server again to confirm the change is successful and the bootdisk path.
root@judi-dev-01:~# prtconf -vp | grep bootpath
bootpath: '/virtual-devices@100/channel-devices@200/disk@1'
root@judi-dev-01:~#
Known Errors : You may be getting the below error while booting the server from secondary disk.
{0} ok boot /virtual-devices@100/channel-devices@200/disk@1
Boot device: /virtual-devices@100/channel-devices@200/disk@1 File and args:
ERROR: Last Trap: Fast Data Access MMU Miss
After attaching the secondary disk you might have used the installboot command as below.
installboot -F zfs /usr/platform/`uname -i`/lib/fs/zfs/bootblk /dev/rdsk/cwtxdys0
This command is incorrect to use in this procedure,
the correct caommnd to install the bootblock is
bootadm install-bootloader
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