Hello,
A couple days ago I increased the rbd cache size from the default to
256MB/osd on a small 4 node, 6 osd/node setup in a test/lab setting.
The rbd volumes are all vm images with writeback cache parameters and
steady if only a few mb/sec writes going on. Logging mostly. I
noticed the recovery throughput went down 10x - 50x . Using Ceph
nautilus. Am I seeing a coincidence or should recovery throughput tank
when rbd cache sizes go up? The underlying pools are mirrored on three
disks each on a different nodes.
Thanks!
Harry Coin
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