zfs i/o error - all block copies unavailable

[Volodymyr Kostyrko]

11.12.2013 22:06, Eugene M. Zheganin написав(ла):
> Hi.
>
> I have a server, it was running 8.2-STABLE/i386 with zfs v28. All of a
> sudden, on last reboot I got a big bunch of "zfs i/o error - all block
> copies unavailable" messages and server was unable to boot. I decided
> that one disk is dying, detached it, and booted successfully. On a next
> boot I got this again. I booted from CD, replaced a zpool.cache, and
> booted successfully once again. On next reboot I got it again, and was
> unable to fix it. However (as you may already know) disks were fine, and
> all the data wasn't corrupted. Iread a couple of mailing list posts
> about this mentioning that this could be an i386 issue, and decided to
> deal with in a radical way: I've installed 10.0-BETA1/amd64 (booted from
> a LiveCD, mounted an NFS share with /usr/src and obj, and did the
> upgrade). Now everything is almost fine, except that I still get this
> message, but only once and it seems to be harmless, as the server can
> still be booted (I experimented and tried this like a dozen times).
>
> So, questions:
>
> - is it really harmless ?

Probably not.

> - can I run with this ?

Probably yes.

> - is there any way to get rid of it ? (probably, without recreating a
> pool, because it holds several TBytes of user data)

Had you updated bootcode after switching to 10.0? Did you issued scrub 
for your pool at least once?

-- 
Sphinx of black quartz, judge my vow.