zfs i/o error - all block copies unavailable

[Andriy Gapon]

on 11/12/2013 22:06 Eugene M. Zheganin said the following:
> 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 ?
> - can I run with this ?
> - is there any way to get rid of it ? (probably, without recreating a pool,
> because it holds several TBytes of user data)
> - and, finally - what does it mean ?

A few words about your pool configuration and the disks that it is comprised of...

-- 
Andriy Gapon