Christian, Bob,
Recovery would be based on placement groups and those degraded groups
would only exist on the storage pool(s) rather than the cache tier in
this scenario.
Precisely.
They are entirely different entities.
There may be partially identical data (clean objects) in them, but that
will with near certainty never be enough for recovery/backfill operation.
Never mind that it would be akin to crossing the streams.
Thanks, so in principle, recovery/backfill write traffic would initially
flow (from storage) into the cache tier pool until full and then migrate
to the storage, right?
Mike
Christian
Bob
On Fri, Mar 25, 2016 at 8:30 AM, Mike Miller <millermike287@xxxxxxxxx>
wrote:
Hi,
in case of a failure in the storage tier, say single OSD disk failure
or complete system failure with several OSD disks, will the remaining
cache tier (on other nodes) be used for rapid backfilling/recovering
first until it is full? Or is backfill/recovery done directly to the
storage tier?
Thanks and regards,
Mike
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