Re: Bluestore with SSD-backed DBs; what if the SSD fails?

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On 2017-10-25 11:21, Wido den Hollander wrote:
> 
>> Op 25 oktober 2017 om 5:58 schreef Christian Sarrasin <c.nntp@xxxxxxxxxxxxxxxxxx>:
>>
>> The one thing I'm still wondering about is failure domains.  With
>> Filestore and SSD-backed journals, an SSD failure would kill writes but
>> OSDs were otherwise still whole.  Replacing the failed SSD quickly would
>> get you back on your feet with relatively little data movement.
>>
> 
> Not true. If you loose your OSD's journal with FileStore without a clean shutdown of the OSD you loose the OSD. You'd have to rebalance the complete OSD.

Could you crosscheck please? Because this
http://ceph.com/geen-categorie/ceph-recover-osds-after-ssd-journal-failure/
suggests otherwise.

-K.
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