[ceph-users] Erasure pool

Caspar Smit casparsmit at supernas.eu
Thu Nov 9 00:55:20 PST 2017


2017-11-08 22:05 GMT+01:00 Marc Roos <M.Roos at f1-outsourcing.eu>:

>
> Can anyone advice on a erasure pool config to store
>
> - files between 500MB and 8GB, total 8TB
> - just for archiving, not much reading (few files a week)
> - hdd pool
> - now 3 node cluster (4th coming)
> - would like to save on storage space
>
> I was thinking of a profile with jerasure  k=3 m=2, but maybe this lrc
> is better? Or wait for 4th node and choose k=4 m=2?
>
>
Just to keep in mind:

In a three node setup with k=3 and m=2 you will have to set the failure
domain to 'osd' (the default failure domain of 'host' would require 5 nodes)
Furthermore when using 'osd' as failure domain you would probably have
(some) inaccessable data when a node reboots and/or fails since there is a
chance 3 (or more) out of 5 chunks are on the same node.
Same goes for 4 nodes and k=4 m=2 (failure domain host would require 6
nodes)

Caspar


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