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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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