Uneven load on drives in ZFS RAIDZ1

[Stefan Esser]

Am 19.12.2011 15:36, schrieb Olivier Smedts:
> 2011/12/19 Stefan Esser <se at freebsd.org>:
>> So: Can anybody reproduce this distribution requests?
> 
> Hello,
> 
> Stupid question, but are your drives all exactly the same ? I noticed
> "ashift: 12" so I think you should have at least one 4k-sector drive,
> are you sure they're not mixed with 512B per sector drives ?

All drives are identical:

<SAMSUNG HD204UI 1AQ10001>         at scbus3 target 0 lun 0 (ada0,pass2)
<SAMSUNG HD204UI 1AQ10001>         at scbus4 target 0 lun 0 (ada1,pass3)
<SAMSUNG HD204UI 1AQ10001>         at scbus5 target 0 lun 0 (ada2,pass4)
<SAMSUNG HD204UI 1AQ10001>         at scbus6 target 0 lun 0 (ada3,pass5)

These are 4KB sector drives. Everything is correctly aligned and all
drives have identical partition (created by a script that was run once
for each drive, so there is no risk of typoes leading to differences).

Regards, STefan