Hey guys,
I'm trying to wrap my head about the Ceph Cache Tiering to discover if what I
want is achievable.
My cluster exists of 6 OSD nodes with normal HDD and one cache tier of SSDs.
What I would love is that Ceph flushes and evicts data as soon as a file hasn't
been requested by a client in a certain timeframe, even if there is enough
space to keep it there longer. The reason I would prefer this is that I have a
feeling overall performance suffers if new writes are coming into the cache
tier while at the same time flush and evicts are happening.
It also seems that for some reason my cache node is not using the cluster
network as much as I expected. Where all HDD nodes are using the cluster
network to the fullest (multiple TBs) my SSD node only used 1GB on the cluster
network. Is there anyway to diagnose this problem or is this intended
behaviour? I expected the flushes to happen over the cluster network.
I appreciate any pointers you might have for me.
Regards,
Maran
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