[OmniOS-discuss] (no subject)

[Stephan Budach]

Am 15.09.15 um 03:46 schrieb Paul B. Henson:
>> From: Omen Wild
>> Sent: Monday, September 14, 2015 3:10 PM
>>
>> Mostly we are wondering how to clear the corruption off disk and worried
>> what else might be corrupt since the scrub turns up no issues.
> While looking into possible corruption from the recent L2 cache bug it seems
> that running 'zdb -bbccsv' is a good test for finding corruption as it looks
> at all of the blocks and verifies all of the checksums.
>
> _______________________________________________
As George Wilson wrote on the ZFS mailing list: " Unfortunately, if the 
corruption impacts a data block then we won't be able to detect it.". 
So, I am afarid apart from metadata and indirect blocks corruption, 
there's no way to even detect a corruption inside a data block, as the 
checksum fits.

I think, the best one can do is to run a scrub and act on the results of 
that. If scrub reports no errors, one can live with that or one would 
need to think of options to reference the data with known, good data 
from that pool, e.g. from a backup prior to 6214 having been introduced, 
but depending on the sheer amount of data or the type of it, that might 
not be even possible.

Cheers,
Stephan