Hi,
Will k=4 and m=2 achieve what I want? I know no data loss with m=2
when 2 OSDs are down, but is the cluster still functioning/writable
in that case?
the default min_size for EC pools is k+1, so no, in above case your
pool would become inactive.
Or m=3 is required to keep cluster functioning while 2 OSDs are down?
I would recommend that, yes. You could decrease min_size to k with
m=2, of course, but it's a safety risk which should only be considered
in the worst case.
In case m=3, what would be the reasonable k?
Overhead 1.5 or 1.6 is efficient enough for me. So, k=5 or k=6?
I would go with k=6, you get a little more storage efficiency out of
it compared to k5m3.
Regards,
Eugen
Zitat von Tony Liu <tonyliu0592@xxxxxxxxxxx>:
Hi,
With Reef, I'd like to keep the cluster functioning while 2 OSDs are down.
The cluster has more than 10 nodes, each of which has 64x 2.5G threads,
256GB memory, 24x NVMe drives and 2x 25GB networking.
Will k=4 and m=2 achieve what I want? I know no data loss with m=2
when 2 OSDs are down, but is the cluster still functioning/writable
in that case?
Or m=3 is required to keep cluster functioning while 2 OSDs are down?
In case m=3, what would be the reasonable k?
Overhead 1.5 or 1.6 is efficient enough for me. So, k=5 or k=6?
Any comments is welcome.
Thanks!
Tony
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