ZFS weird device tasting loop since MFC

[Ulrich Spörlein]

On Tue, 02.06.2009 at 11:16:10 +0200, Ulrich Spörlein wrote:
> Hi all,
> 
> so I went ahead and updated my ~7.2 file server to the new ZFS goodness,
> and before running any further tests, I already discovered something
> weird and annoying.
> 
> I'm using a mirror on GELI, where one disk is usually *not* attached as
> a means of poor man's backup. (I had to go that route, as send/recv of
> snapshots frequently deadlocked the system, whereas a mirror scrubbing
> did not)
> 
> root at coyote:~# zpool status
>   pool: tank
>  state: DEGRADED
> status: The pool is formatted using an older on-disk format.  The pool can
>         still be used, but some features are unavailable.
> action: Upgrade the pool using 'zpool upgrade'.  Once this is done, the
>         pool will no longer be accessible on older software versions.
>  scrub: none requested
> config:
> 
>         NAME                      STATE     READ WRITE CKSUM
>         tank                      DEGRADED     0     0     0
>           mirror                  DEGRADED     0     0     0
>             ad4.eli               ONLINE       0     0     0
>             12333765091756463941  REMOVED      0     0     0  was /dev/da0.eli
> 
> errors: No known data errors
> 
> When imported, there is a constant "tasting" of all devices in the system,
> which also makes the floppy drive go spinning constantly, which is really
> annoying. It did not do this with the old ZFS, are there any remedies?
> 
> gstat(8) is displaying the following every other second, together with a
> spinning fd0 drive.
> 
> dT: 1.010s  w: 1.000s  filter: ^...$
>  L(q)  ops/s    r/s   kBps   ms/r    w/s   kBps   ms/w   %busy Name
>     0      0      0      0    0.0      0      0    0.0    0.0| fd0
>     0      8      8   1014    0.1      0      0    0.0    0.1| md0
>     0     32     32   4055    9.2      0      0    0.0   29.2| ad0
>     0     77     10   1267    7.1     63   1125    2.3   31.8| ad4
> 
> There is no activity going on, especially md0 is for /tmp, yet it
> constantly tries to read stuff from everywhere. I will now insert the
> second drive and see if ZFS shuts up then ...

It does, but it also did not start resilvering the second disk:

root at coyote:~# zpool status
  pool: tank
 state: ONLINE
status: One or more devices has experienced an unrecoverable error.  An
        attempt was made to correct the error.  Applications are unaffected.
action: Determine if the device needs to be replaced, and clear the errors
        using 'zpool clear' or replace the device with 'zpool replace'.
   see: http://www.sun.com/msg/ZFS-8000-9P
 scrub: none requested
config:

        NAME         STATE     READ WRITE CKSUM
        tank         ONLINE       0     0     0
          mirror     ONLINE       0     0     0
            ad4.eli  ONLINE       0     0     0
            da0.eli  ONLINE       0     0    16

errors: No known data errors

Will now run the scrub and report back in 6-9h.

Cheers,
Ulrich Spörlein
-- 
http://www.dubistterrorist.de/