On 01/02/2013 03:40 PM, Andrey Korolyov wrote:
I have just observed that ceph-mon process, at least bobtail one, has
an extremely high density of writes - times above _overall_ cluster
amount of writes, measured by qemu driver(and they are very close to
be fair). For example, test cluster of 32 osds have 7.5 MByte/s of
writes on each mon node having overall amount about 1.5 Mbyte/s and
dev- with only three osds has values is about 1Mbyte/s with
accumulated real write bandwidth of tens of kilobytes per second.
I`m afraid if this is normal, I may hit a limit of spinning storage
increasing test cluster, say, twenty times up of number of osd and
related ``idle'' write bandwidth.
High debugging levels (specially 'debug ms', 'debug mon' or 'debug
paxos') should significantly increase IO on the monitors. Might that be
the case?
-Joao
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