On 23.10.2017 20:29, Karun Josy wrote:
Hi,
While creating a pool with erasure code profile k=10, m=4, I get PG
status as
"200 creating+incomplete"
While creating pool with profile k=5, m=3 it works fine.
Cluster has 8 OSDs with total 23 disks.
Is there any requirements for setting the first profile ?
you need K+M+X osd nodes. K and M comes from the profile, X is how many
nodes you want to be able to tolerate failure of, without becoming
degraded. (how many failed nodes ceph should be able to automatically heal)
so with K=10 + M = 4 you need minimum 14 nodes and you have 0 fault
tolerance (a single failure = a degreded cluster) so you have to
scramble to replace the node to get HEALTH OK again. if you have 15
nodes you can loose 1 node and cehp will automatically rebalance to the
14 needed nodes, and you can replace the lost node at your leisure.
kind regards
Ronny Aasen
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