18 Feb 2011
Scenario: the current Solaris Sparc system is booting off a single UFS disk (eg when cloned from an image).
You want to convert to a ZFS mirror. Assumes that ZFS is already supported; if not install the ZFS package first. See also:
- Managing ZFS Boot Environments with Solaris Live Upgrade, in Solaris 10 ZFS Essentials
- Notes on OpenSolaris: ZFS boot mirror
- HOWTO: Migrate a UFS Root Filesystem to ZFS
Connect to the console, login, examine the disk layout:
-> start /SP/console
root@foo # uname -a
SunOS foo 5.10 Generic_142900-11 sun4v sparc SUNW,Sun-Blade-T6320
root@foo # mount | fgrep '/dev/dsk'
/ on /dev/dsk/c0t0d0s0 read/write/setuid/devices/intr/largefiles/logging/xattr/onerr
or=panic/dev=800008 on Thu Feb 17 12:04:28 2011
root@foo # echo | format
Searching for disks...done
AVAILABLE DISK SELECTIONS:
0. c0t0d0
/pci@0/pci@0/pci@2/LSILogic,sas@0/sd@0,0
1. c0t1d0
/pci@0/pci@0/pci@2/LSILogic,sas@0/sd@1,0
Specify disk (enter its number): Specify disk (enter its number):
So on this system, / is currently mounted on target 0 (c0t0d0). We want to zfs mirror onto target 1 (c0t1d0), and allow booting from both drives.
Clear the current partition table on target 1, and create partition 0 covering the whole disk. **Label **the disk as SMI (ie traditional Solaris VTOC. EFI labels are not supported for boot disks).
format -e Specify disk (enter its number): 1 selecting c0t1d0 format> p (etc) format> label [0] SMI Label [1] EFI Label Specify Label type[1]: 0 format>
**Create ** the new zfs pool:
root@foo # zpool create rpool c0t1d0s0
**Create ** the zfs boot environment:
root@foo # lucreate -n zfsBE -p rpool Analyzing system configuration. ... Populating contents of mount point . Copying.
**Check **the results:
root@foo # lustatus Boot Environment Is Active Active Can Copy Name Complete Now On Reboot Delete Status -------------------------- -------- ------ --------- ------ ---------- be0 yes yes yes no - be3 yes no no yes - zfsBE yes no no yes -
**Activate **the environment and reboot:
root@foo # luactivate zfsBE
A Live Upgrade Sync operation will be performed on startup of boot environment .
**********************************************************************
The target boot environment has been activated. It will be used when you
reboot. NOTE: You MUST NOT USE the reboot, halt, or uadmin commands. You
MUST USE either the init or the shutdown command when you reboot. If you
do not use either init or shutdown, the system will not boot using the
target BE.
**********************************************************************
In case of a failure while booting to the target BE, the following process
needs to be followed to fallback to the currently working boot environment:
1. Enter the PROM monitor (ok prompt).
2. Change the boot device back to the original boot environment by typing:
setenv boot-device /pci@0/pci@0/pci@2/LSILogic,sas@0/disk@0,0:a
3. Boot to the original boot environment by typing:
boot
**********************************************************************
Modifying boot archive service
Activation of boot environment successful.
root@foo # init 6
After rebooting, you should see your new zfs root environment:
root@foo # zfs list
NAME USED AVAIL REFER MOUNTPOINT
rpool 16.1G 258G 98K /rpool
rpool/ROOT 10.0G 258G 21K /rpool/ROOT
rpool/ROOT/zfsBE 10.0G 258G 10.0G /
rpool/dump 2.00G 258G 2.00G -
rpool/swap 4.01G 262G 16K -
root@foo # zpool status
pool: rpool
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
rpool ONLINE 0 0 0
c0t1d0s0 ONLINE 0 0 0
errors: No known data errors
As you can see, rpool only contains one hard disk (c0t1d0s0).** Delete **the old boot environments, otherwise format will complain:
root@foo # lustatus Boot Environment Is Active Active Can Copy Name Complete Now On Reboot Delete Status -------------------------- -------- ------ --------- ------ ---------- be0 yes no no yes - be3 yes no no yes - zfsBE yes yes yes no - root@foo # ludelete be0 ... root@foo # ludelete be3 Determining the devices to be marked free. Updating boot environment configuration database. Updating boot environment description database on all BEs. Updating all boot environment configuration databases. Boot environment deleted.
**Repartition **and mirror onto the original hard disk. Notice that the current ZFS root disk is the first argument in the attach command, and the old boot disk is the second argument. Use -f when it complains about an existing UFS filesystem:
root@foo # format -e
(repartition, relabel as SMI, etc)
root@foo # zpool status
pool: rpool
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
rpool ONLINE 0 0 0
c0t1d0s0 ONLINE 0 0 0
errors: No known data errors
root@foo # zpool attach -f rpool c0t1d0s0 c0t0d0s0
Please be sure to invoke installboot(1M) to make 'c0t0d0s0' bootable.
Make sure to wait until resilver is done before rebooting.
root@foo # 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, 11.50% done, 0h11m to go
config:
NAME STATE READ WRITE CKSUM
rpool ONLINE 0 0 0
mirror ONLINE 0 0 0
c0t1d0s0 ONLINE 0 0 0
c0t0d0s0 ONLINE 0 0 0 1.38G resilvered
errors: No known data errors
root@foo # zpool status rpool
...
scrub: resilver completed after 0h11m with 0 errors on Fri Feb 18 14:31:09 2011
...
c0t0d0s0 ONLINE 0 0 0 12.0G resilvered
Make bootable off target 0, and confirm:
root@foo # installboot /usr/platform/`uname -i`/lib/fs/zfs/bootblk /dev/rdsk/c0t0d0s0
root@foo # init 0
...
svc.startd: 104 system services are now being stopped.
...
{0} ok devalias
...
disk1 /pci@0/pci@0/pci@2/@/disk@1
disk0 /pci@0/pci@0/pci@2/@/disk@0
disk /pci@0/pci@0/pci@2/@/disk@0
...
{0} ok boot disk0
Boot device: /pci@0/pci@0/pci@2/@/disk@0 File and args:
SunOS Release 5.10 Version Generic_142900-11 64-bit
...
root@foo # init 0
...
svc.startd: 104 system services are now being stopped.
...
{0} ok boot disk1
...
Boot device: /pci@0/pci@0/pci@2/@/disk@1 File and args:
SunOS Release 5.10 Version Generic_142900-11 64-bit
...
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