I have a 4 node cluster. Each one has 1 SSD for the OS and block.dbs
(50Gb partition for each OSD), one 4Tb hdd and two 8Tb hdds.
I have 15% iowait average.
In any other server 15% seems too much. But ceph is a storage service
cluster.
There's a way to minimize the iowait or to better measure where is my
bottleneck? (¿Any of the HDDs maybe?)
Is time to stop changing my HDDs for bigger ones and add a new node?
--
Alfrenovsky
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