On 04.12.2017 19:18, tim taler wrote:
In size=2 losing any 2 discs on different hosts would probably cause data to
be unavailable / lost, as the pg copys are randomly distribbuted across the
osds. Chances are, that you can find a pg which's acting group is the two
failed osd (you lost all your replicas)
okay I see, getting clearer at least ;-)
you can also consider running size=2, min_size=2 while restructuring.
it will block your problematic pg's if there is a failure, until the
rebuild/rebalance is done. But it should be a bit more resistant to full
cluster loss and/or corruption.
basically it means if there is less then 2 copies do not accept writes.
if you want to do this depends on your requirements,
is it a bigger disaster to be unavailable a while, then there is to
restore from backup.
kind regards
Ronny Aasen
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