Hi Y'all,
We have a new ceph cluster online that looks like this:
md-01 : monitor, manager, mds
md-02 : monitor, manager, mds
md-03 : monitor, manager
store-01 : twenty 30TB NVMe OSDs
store-02 : twenty 30TB NVMe OSDs
The cephfs storage is using erasure coding at 4:2. The crush domain is
set to "osd".
(I know that's not optimal but let me get to that in a minute)
We have a current regular single NFS server (nfs-01) with the same
storage as the OSD servers above (twenty 30TB NVME disks). We want to
wipe the NFS server and integrate it into the above ceph cluster as
"store-03". When we do that, we would then have three OSD servers. We
would then switch the crush domain to "host".
My question is this: Given that we have 4:2 erasure coding, would the
data rebalance evenly across the three OSD servers after we add store-03
such that if a single OSD server went down, the other two would be
enough to keep the system online? Like, with 4:2 erasure coding, would
2 shards go on store-01, then 2 shards on store-02, and then 2 shards on
store-03? Is that how I understand it?
Thanks for any insight!
-erich
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