zpool offline - no such device

[Janos Dohanics]

On Tue, 03 Jun 2014 17:55:46 -0400
Daniel Staal <DStaal at usa.net> wrote:

> --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.

Thanks for your reply.

> 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.

Here is what gpart says about ada1:

# gpart show -p
[...]

=>        34  1953525101    ada1  GPT  (931G)
          34          94          - free -  (47k)
         128     4194304  ada1p1  freebsd-swap  (2.0G)
     4194432  1949330696  ada1p2  freebsd-zfs  (929G)
  1953525128           7          - free -  (3.5k)

> > 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

So, I should do gpart backup/restore first?

-- 
Janos Dohanics