Hello All,
I am trying to mirror two non-root hard drives using zfs. But "fmthard" fails when I try to copy the vtoc due to disk mismatch. Please help me.
--- iostat command shows the disk to be similiar
--- format command shows disk to be different 
--- c1t2d0 is the active disk and I need to mirror data to c1t3d0. I have formatted c1t3d0 twice. But this did not help. Any suggestions are welcome.
Here's info regarding the disks:
a) Output of iostat:
c1t2d0 Soft Errors: 0 Hard Errors: 0 Transport Errors: 0
Vendor: SEAGATE Product: ST314670LSUN146G Revision: 045A Serial No: 060443G1AE
Size: 146.81GB <146810536448 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0
Illegal Request: 0 Predictive Failure Analysis: 0
c1t3d0 Soft Errors: 0 Hard Errors: 0 Transport Errors: 0
Vendor: SEAGATE Product: ST314670LSUN146G Revision: 045A Serial No: 060443HD5F
Size: 146.81GB <146810536448 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0
Illegal Request: 0 Predictive Failure Analysis: 0
b) Output of format:
2. c1t2d0 <SEAGATE-ST314670LSUN146G-045A-136.73GB>
/pci@1c,600000/scsi@2/sd@2,0
3. c1t3d0 <SUN146G cyl 14087 alt 2 hd 24 sec 848>
/pci@1c,600000/scsi@2/sd@3,0
why do you use fmthard for a zfs mirror?
Thanks for replying 
I did that to copy the VTOC. Is that wrong? I tried to follow the procedure for ZFS Root mirror. Please let me know the correct procedure.
just create a mirrored zpool with the two disks and you are done...
# zpool create <poolname> mirror yourdrive1 yourdrive2
I would say because the pool is on a slice and not the whole disk. What says "zpool status" ?
@pingmeback: can you post the commands you run to copy the vtoc and the errors you got ?
Thanks guys for helping me out!
Here's complete output of "zpool status" which includes
- root pool (rpool) which is mirrored
- "data" pool containing c1t2d0 which I need to mirror to c1t3d0
#zpool status
pool: data
state: ONLINE
status: The pool is formatted using an older on-disk format. The pool can
still be used, but some features are unavailable.
action: Upgrade the pool using 'zpool upgrade'. Once this is done, the
pool will no longer be accessible on older software versions.
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
data ONLINE 0 0 0
c1t2d0 ONLINE 0 0 0
errors: No known data errors
pool: rpool
state: ONLINE
status: The pool is formatted using an older on-disk format. The pool can
still be used, but some features are unavailable.
action: Upgrade the pool using 'zpool upgrade'. Once this is done, the
pool will no longer be accessible on older software versions.
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
rpool ONLINE 0 0 0
mirror ONLINE 0 0 0
c1t0d0s0 ONLINE 0 0 0
c1t1d0s0 ONLINE 0 0 0
errors: No known data errors
then add the new disk to the pool... which command do you use?
Re: [zfs-discuss] Add mirror to an existing Zpool
There is indeed no vtoc to copy.
So will the following command work:
zpool attach -f data c1t2d0 c1t3d0
^ ^
| |
(disk containing data)__| |__(Spare empty disk)
---------- Post updated at 06:52 PM ---------- Previous update was at 06:42 PM ----------
Thanks guys. Looks like it's working.... will keep an eye on it until it finishes.
bash-3.00# zpool status
pool: data
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 0h0m, 28.25% done, 0h2m to go
config:
NAME STATE READ WRITE CKSUM
data ONLINE 0 0 0
mirror ONLINE 0 0 0
c1t2d0 ONLINE 0 0 0
c1t3d0 ONLINE 0 0 0 1.93G resilvered