Ok, now I'm getting somewhere.
vault:/#dd if=/dev/zero of=/dev/dsk/c5t6d0 bs=512 count=64000
64000+0 records in
64000+0 records out
vault:/#dd if=/dev/zero of=/dev/dsk/c5t6d0 bs=512 count=64000 oseek=976174591
64000+0 records in
64000+0 records out
vault:/#zpool replace pool c5t6d0
vault:/#
Looks like I didn't do the steps in the right order before. Zeroing out the
first and last 32MB and immediately running a zpool replace worked.
vault:/#zpool status
pool: pool
state: DEGRADED
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, 54.48% done, 0h2m to go
config:
NAME STATE READ WRITE CKSUM
pool DEGRADED 0 0 0
raidz2 ONLINE 0 0 0
...
c4t10d0 ONLINE 0 0 0
c5t2d0 ONLINE 0 0 0
replacing DEGRADED 0 0 0
c5t6d0s0/o UNAVAIL 0 0 0 cannot open
c5t6d0 ONLINE 0 0 0
c5t10d0 ONLINE 0 0 0
...
[2 minutes later]
vault:/#zpool status
pool: pool
state: ONLINE
scrub: resilver completed with 0 errors on Fri Jan 5 15:11:20 2007
Woohoo!
For the record, I got the block size from format <verify>:
format> verify
Volume name = < >
ascii name = <IFT-A24U-G2421-1-347G-465.51GB>
bytes/sector = 512
sectors = 976238590
accessible sectors = 976238557
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