ZFS scrub on new disks gives cksum errors

[Sean Chittenden]

I had this exact problem at home on my FreeNAS host when a box is plugged
in to residential power that is "not clean."  If you plug this host in to a
UPS it should clear things up instantly (find a sine wave UPS, not a
digital stepping supply).  There's something about the fluctuating power or
brownouts that ZFS is well suited to detecting (and became terrifying to me
because wtf happened in the past pre-ZFS??).

-sc



On Mon, Dec 8, 2014 at 8:00 AM, Steven Hartland <killing at multiplay.co.uk>
wrote:

> Bad memory, cabling?
>
>
> On 08/12/2014 15:53, Brian N wrote:
>
>> Hi.
>>
>> I have two new 3TB disks that I'm testing prior to installing in a
>> production
>> server.  I created a zpool mirror, dumped a bunch of data to the pool and
>> ran a
>> scrub.  I got back numerous CKSUM errors, the same number on each drive.
>> I'm
>> guessing this is not a problem with my 3TB drives but a controller or some
>> other hardware problem.  Is this a correct assumption?
>>
>> The PC where I'm running this test is using a GA-E7AUM-DS2H mainboard and
>> non-ecc memory.
>>
>> ######
>>
>> root at server:~ # zpool status
>>    pool: tank
>>   state: ONLINE
>> status: One or more devices has experienced an error resulting in data
>>          corruption.  Applications may be affected.
>> action: Restore the file in question if possible.  Otherwise restore the
>>          entire pool from backup.
>>     see: http://illumos.org/msg/ZFS-8000-8A
>>    scan: scrub repaired 0 in 3h57m with 23 errors on Mon Dec  8 03:05:28
>> 2014
>> config:
>>
>>          NAME        STATE     READ WRITE CKSUM
>>          tank        ONLINE       0     0    23
>>            mirror-0  ONLINE       0     0    46
>>              ada1    ONLINE       0     0    46
>>              ada3    ONLINE       0     0    46
>>
>> errors: 2 data errors, use '-v' for a list
>>
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-- 
Sean Chittenden