On 08/13/2012 12:48 PM, Ray Arachelian wrote:
> While attempting to fix the last of my damaged zpools, there's one that
> consists of 4 drives + one 60G file.  The file happened by accident - I
> attempted to add a partition off an SSD drive but missed the cache
> keyword.  Of course, once this is done, there's no way to remove the new
> unwanted member.  I fixed this by creating a file with mkfile, and
> adding the file as a mirror of the SSD partition, then removed the SSD
> partition from the zpool and kept the file around.
> Over time something went wrong with this zpool and it hung the OS from
> booting, so I removed it from the machine, but held on to it so I could
> attempt to recover.
> I'm trying to recover it now, but when I try to import it without cache
> and read only, it tells me a member is missing (the file of course). 
> But, how do I pass the file name as a member of the zpool to the import
> command?
> Since it's only 60g, I suppose I could dd the file over to an external
> USB drive.  Would that work?  Do I have to write it to slice 0, or a
> whole volume (slice 2)? I'm guessing this might be the path of least
> resistance...
> Or is there some hidden option to zpool import where you can pass it
> file/device names that I'm no aware of?  (Attempting to use zpool online
> poolname /path/to/file doesn't work since the zpool isn't imported yet. 
> Catch 22 there.) :)
> Otherwise, I do have a backup of the /etc/zfs/zpool.cache that contains
> references to this zpool, but it seems that this is corrupted and
> prevents all zpool operations.  I've tried to replace the zpool members,
> but it won't let me.  I've even used a hex editor to replace the device
> names in the zpool.cache file with the new device names, but it's still
> locked.  So I can't use the zpool cache file as a way to point to the
> file member.  Is there some way to clear the "corrupted" flag in the
> zpool.cache from allowing zpool commands to work?
> I'm on oi151a5, but this zpool was created around oi134/135 or so.

See the -d option to zpool import.


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