zpool offline - no such device

[Daniel Staal]

--As of June 3, 2014 10:44:16 AM -0400, Janos Dohanics is alleged to have 
said:

> 	NAME                                            STATE     READ WRITE
> CKSUM 	vol1                                            DEGRADED     0
> 0     0 	  raidz1-0                                      DEGRADED     0
> 0     0 	    gptid/e433f9c3-0545-11e1-812d-8c89a53220c1  ONLINE       0
> 0     0 	    gptid/e485eeba-0545-11e1-812d-8c89a53220c1  FAULTED     49
> 260     0  too many errors
> gptid/e4d8ee9d-0545-11e1-812d-8c89a53220c1  ONLINE       0     0     0
>
> errors: No known data errors
>
> From the output of "gpart list",
> gptid/e485eeba-0545-11e1-812d-8c89a53220c1 corresponds to ada1p2.
>
> So, using the example from the handbook, I tried:
>
># zpool offline vol1 ada1
> cannot offline ada1: no such device in pool
>
> Why is it that zpool doesn't know about the ada1 device?

Because ada1 isn't in your pool - 
'gptid/e485eeba-0545-11e1-812d-8c89a53220c1' aka 'ada1p2' is.

That is only one of the partitions of ada1 - there may be more.  (It's 
entirely possible that *all* of the devices in the zpool are on ada1...) 
In fact there is likely at least one more: ada1p1.

Before you do anything else, it's probably a good idea to figure out 
exactly what is on that disk and how many partitions it has.  Pulling it 
out may not affect the zpool - but it may break other things in your 
system, depending on what's on there.

> For the failing drive, "zdb" gives:
>
> guid: 16455153587833556178
>
> Should I try "zpool offline vol1 [guid]"?

I would try `zpool offline gptid/e485eeba-0545-11e1-812d-8c89a53220c1` - 
that's what zfs calls the disk.  But I'm not entirely sure about it either 
- it would be a lot easier if these partitions had gpt lables, which I know 
work well with ZFS.

> When I'm replacing the failing drive with a new one (in the same USB
> slot), can I expect "zpool replace vol1 ada1" to work?

That should probably work - but remember the mention above of working out 
what *else* is on that drive.  This command would take the whole disk for 
ZFS, and you may want to replace the other partitions of the bad disk with 
something.

Daniel T. Staal

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