Re: OSD behavior, in case of its journal disk (either HDD or SSD) failure

[ceph@xxxxxxxxxx]

Hi,
I have try this a month before.
Unfortunaly the Script Did Not worked out but if you Do the described steps manualy it works.
The important thing is that /var/lib/ceph/osd.x/Journal (Not sure about the path) should Show to right place where your Journal should be.

Am 25. Januar 2016 16:48:32 MEZ, schrieb Loris Cuoghi <lc@xxxxxxxxxxxxxxxxx>:

Le 25/01/2016 15:28, Mihai Gheorghe a écrit :
 As far as i know you will not lose data, but it will be unaccessable
 untill you bring the journal back online.

http://www.sebastien-han.fr/blog/2014/11/27/ceph-recover-osds-after-ssd-journal-failure/

After this, we should be able to restart the OSDs and wait for recovery.

Never done this, anyone has experience to share?


 2016-01-25 16:23 GMT+02:00 Daniel Schwager <Daniel.Schwager@xxxxxxxx
 <mailto:Daniel.Schwager@xxxxxxxx>>:

     Hi,
 ok...OSD stop. Any reason why OSD stop ( I assume if journal disk
 fails, OSD should work as no journal. Isn't it?)

     No. In my understanding - if a journal fails, all the attached (to
     this Journal HDD) OSD's fails also.

     E.g. if you have 4 OSD's with the 4 journals's located on one
     SSD-hard disk, the failure of this SSD
     will crash/fail also your 4 OSD's.

     regards
     Danny



 Not understand, why the OSD data lost. You mean - data lost
     during the
 traction time? or total OSD data lost?

 Thanks
 Swami

 O
 n Mon,
Jan 25, 2016 at 7:06 PM, Jan Schermer <jan@xxxxxxxxxxx
     <mailto:jan@xxxxxxxxxxx>> wrote:
 OSD stops.
 And you pretty much lose all data on the OSD if you lose the
     journal.

 Jan

 On 25 Jan 2016, at 14:04, M Ranga Swami Reddy
     <swamireddy@xxxxxxxxx
<mailto:swamireddy@xxxxxxxxx>> wrote:

 Hello,

 If a journal disk fails (with crash or power failure, etc), what
 happens on OSD operations?

 PS: Assume that journal and OSD is on a separate drive.

 Thanks
 Swami

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