Re: pg scrub and auto repair in hammer

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On Sun, 26 Jun 2016 19:48:18 +0200 Stefan Priebe wrote:

> Hi,
> 
> is there any option or chance to have auto repair of pgs in hammer?
>
Short answer: 
No, in any version of Ceph.

Long answer:
There are currently no checksums generated by Ceph and present to
facilitate this.
That's on the roadmap for Bluestore (not in there yet either).

If you'd run BTRFS or ZFS with filestore you'd be closer to an automatic
state of affairs, as these filesystems do strong checksums and check them
on reads and would create an immediate I/O error if something got
corrupted, thus making it clear which OSD is in need of the hammer of
healing.

So ideally with Bluestore and strong checksums Ceph could indeed react to
a read error automatically and fix things right away, w/o waiting for
scrub.

Christian
-- 
Christian Balzer        Network/Systems Engineer                
chibi@xxxxxxx   	Global OnLine Japan/Rakuten Communications
http://www.gol.com/
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