Borrowed USB stick today and did same excersize as below (# zpool create tank 
raidz da5{d,e,f}) with exactly same outcome.

On 19.01.2013, at 23:26, Alexander Nedotsukov <bl...@bbnest.net> wrote:

> Hi All,
> 
> Just a note that after catch up with -current my zfs pool kissed good bye. 
> I'll omit details about its last days and go strait to the final state:
> 
> Creating pool from scratch:
> 
> #zpool create tank raidz da{1..3}
> #zpool status
>  pool: tank
> state: ONLINE
>  scan: none requested
> config:
> 
>       NAME        STATE     READ WRITE CKSUM
>       tank        ONLINE       0     0     0
>         raidz1-0  ONLINE       0     0     0
>           da1     ONLINE       0     0     0
>           da2     ONLINE       0     0     0
>           da3     ONLINE       0     0     0
> 
> errors: No known data errors
> #zfs list
> NAME   USED  AVAIL  REFER  MOUNTPOINT
> tank   140K  3,56T  40,0K  /tank
> 
> Let's use some space out of it.
> 
> #dd if=/dev/zero of=/tank/foo
> ^C250939+0 records in
> 250938+0 records out
> 128480256 bytes transferred in 30.402453 secs (4225983 bytes/sec)
> 
> Oops...
> 
> #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://illumos.org/msg/ZFS-8000-9P
>  scan: scrub repaired 5K in 0h0m with 0 errors on Sat Jan 19 23:11:20 2013
> config:
> 
>       NAME        STATE     READ WRITE CKSUM
>       tank        ONLINE       0     0     0
>         raidz1-0  ONLINE       0     0     0
>           da1     ONLINE       0     0     1
>           da2     ONLINE       0     0     0
>           da3     ONLINE       0     0     1
> 
> At some state (more data copied) it is enough to do another scrub run to 
> trigger new cksum errors / unrecoverable file loss.
> I do not see any error messages from kernel and smartctl output has zero 
> error counters.
> Full memtest cycle seems to be all right.
> Kernel built with gcc is suffering from same sympthoms.
> Tried to create raidz pool out of files and it worked fine (even placed one 
> chunk to UFS made out of da0). 
> 
> Any idea what it can be?
> 
> Last kernel which did work was back from October 2012.
> 
> Thanks,
> Alexander.
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