Hi Milosz,
Thanks for your comments.
We think SSD and fscache based write cache is definitely useful for
Ceph, since to some extent, write amplification slow down the write
performance of Ceph. Lustre has already introduced SSD based write
cache. SSD can be treated as an outer big cache for
Li,
I think it would be fantastic to see a write cache. In many workloads
you ended up writing out a file and then turning around and reading it
right back in on the same node.
There's a few things that I would like to see. First, an mount option
to turn on/off write through caching. There are so
Currently, fscache only plays as read cache for ceph, this patch
enables it plays as the write through cache as well.
A small trick to be discussed: if the writing to OSD finishes before
the writing to fscache, the fscache writing is cancelled to avoid
slow down the writepages() process.
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