ZFS Snapshot problems

[Matthew Seaman]

On 12/02/2012 11:56, Peter Maloney wrote:
> I had a problem where I could not delete, rename, send, etc. a
> snapshot... , (possibly caused by a kernel panic during a zfs
> replication). Maybe yours is related. I did not try viewing the contents
> of my snapshot.
> 
> If it is related, the solution is:
> 
> zdb -d poolname | grep %
> 
> Expect the command to take long, and output should include all your
> clones you made, plus some "Input/output errors" for some others. Pay
> attention to the ones with errors, and then delete those, then try to
> access your snapshot again.

Interesting.  I guess this is not the expected output?

lucid-nonsense:/usr/home/matthew:# zpool list
NAME    SIZE  ALLOC   FREE    CAP  DEDUP  HEALTH  ALTROOT
zroot   448G  42.9G   405G     9%  1.20x  ONLINE  -
lucid-nonsense:/usr/home/matthew:# zdb -d zroot | grep %
zdb: can't open 'zroot': No such file or directory

Running truss(1) on zdb shows:

open("/dev/gpt/disk0",O_RDONLY,00)		 ERR#2 'No such file or directory'
open("/dev/gpt/disk2",O_RDONLY,00)		 ERR#2 'No such file or directory'

which is true -- /dev/gpt is empty.  But disk0 and disk1 should show up:

lucid-nonsense:/usr/home/matthew:# gpart show -l /dev/ad0
=>       34  976773101  ad0  GPT  (465G)
         34        128    1  (null)  (64k)
        162   33554432    2  swap0  (16G)
   33554594  943218541    3  disk0  (449G)

lucid-nonsense:/usr/home/matthew:# gpart show -l /dev/ad2
=>       34  976773101  ad2  GPT  (465G)
         34        128    1  (null)  (64k)
        162   33554432    2  swap2  (16G)
   33554594  943218541    3  disk2  (449G)

... and come to think of it: the disk0 and disk2 labels used to show up
here too:

lucid-nonsense:/usr/home/matthew:# zpool status zroot
  pool: zroot
 state: ONLINE
  scan: scrub repaired 0 in 3h35m with 0 errors on Sun Feb 12 11:14:10 2012
config:

	NAME                                            STATE     READ WRITE CKSUM
	zroot                                           ONLINE       0     0     0
	  mirror-0                                      ONLINE       0     0     0
	    gptid/848287e9-5f8e-11df-808e-e0cb4e266481  ONLINE       0     0     0
	    gptid/a6d0bec4-5f8e-11df-808e-e0cb4e266481  ONLINE       0     0     0

errors: No known data errors

	Cheers,

	Matthew

-- 
Dr Matthew J Seaman MA, D.Phil.
PGP: http://www.infracaninophile.co.uk/pgpkey


-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 267 bytes
Desc: OpenPGP digital signature
Url : http://lists.freebsd.org/pipermail/freebsd-fs/attachments/20120212/df799879/signature.pgp