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I have one question, what can or can't do a cluster working on
degraded mode?
With K=10 + M = 4 if one of my OSDs node fails it will start
working on degraded mode, but can I still do writes and reads from
that pool?
El 23/10/2017 a las 21:01, Ronny Aasen
escribió:
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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--
Jorge Pinilla López
jorpilo@xxxxxxxxx
Estudiante de ingenieria informática
Becario del area de sistemas (SICUZ)
Universidad de Zaragoza
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