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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