I had similar problems replacing a drive myself, it's not intuitive exactly
which ZFS commands you need to issue to recover from a drive failure.
I think your problems stemmed from using -f. Generally if you have to use
that, there's a step or option you've missed somewhere.
However I'm not 100% sure what command you should have used instead. Things
I've tried in the past include:
# zpool replace test c2t2d0 c2t2d0
or
# zpool online test c2t2d0
# zpool replace test c2t2d0
I know I did a whole load of testing various options to work out how to replace
a drive in a test machine. I'm looking to see if I have any iSCSI notes
around, but from memory when I tested iSCSI I was also testing ZFS on a
cluster, so my solution was to simply get the iSCSI devices working on the
offline node, then failover ZFS.
It only took 2-3 seconds to failover ZFS to the other node, and I suspect I
used that solution because I couldn't work out how to get ZFS to correctly
bring faulted iSCSI devices back online.
However, in case it helps, I do have the whole process for physical disks on a
Sun x4500 documented:
# zpool offline splash c5t7d0
Now, find the controller in use for this device:
# cfgadm | grep c5t7d0
sata3/7::dsk/c5t7d0 disk connected configured ok
And offline it with:
# cfgadm -c unconfigure sata3/7
Verify that it is now offline with:
# cfgadm | grep sata3/7
sata3/7 disk connected unconfigured ok
Now remove and replace the disk.
Bring the disk online and check it's status with:
# cfgadm -c configure sata3/7
# cfgadm | grep sata3/7
sata3/7::dsk/c5t7d0 disk connected configured ok
Bring the disk back into the zfs pool. You will get a warning:
# zpool online splash c5t7d0
warning: device 'c5t7d0' onlined, but remains in faulted state
use 'zpool replace' to replace devices that are no longer present
# zpool replace splash c5t7d0
you will now see zpool status report that a resilver is in process, with detail
as follows:
raidz2 DEGRADED 0 0 0
spare DEGRADED 0 0 0
replacing DEGRADED 0 0 0
c5t7d0s0/o UNAVAIL 0 0 0 corrupted data
c5t7d0 ONLINE 0 0 0
Once the resilver finishes, run zpool status again and it should appear fine.
Note: I sometimes had to run zpool status twice to get an up to date status
of the devices.
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