Recently , I want to enable rbd cache to identify performance benefit. I add
rbd_cache=true option in my ceph configure file, I use 'virsh attach-device' to
attach rbd to vm, below is my vdb xml file.
<disk type='network' device='disk'>
<driver name='qemu' type='raw' cache='writeback'/>
<source protocol='rbd'
name='rbd/node12_2:rbd_cache=true:rbd_cache_writethrough_until_flush=true'/>
<target dev='vdb' bus='virtio'/>
<serial>6b5ff6f4-9f8c-4fe0-84d6-9d795967c7dd</serial>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06'
function='0x0'/>i
</disk>
I do not know this is ok to enable rbd cache. I see perf counter for rbd cache
in source code, but when I used admin daemon to check rbd cache statistics,
Ceph -admin-daemon /var/run/ceph/ceph-osd.0.asok perf dump
But I did not get any rbd cahce flags.
My question is how to enable rbd cahce and check rbd cache perf counter, or how
can I make sure rbd cache is enabled, any tips will be appreciated? Thanks in
advanced.
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