Hello,
I want to enable the qemu rbd writeback cache, the following is the settings in /etc/ceph/ceph.conf
[client]
rbd_cache = true
rbd_cache_writethrough_until_flush = false
rbd_cache_size = 27180800
rbd_cache_max_dirty = 20918080
rbd_cache_target_dirty = 16808000
rbd_cache_max_dirty_age = 60
and the next section is the vm definition xml:
<disk type='network' device='disk'>
<driver name='qemu' cache='writeback'/>
<auth username='estack'>
<secret type='ceph' uuid='101ae7dc-bd59-485e-acba-efc8ddbe0d01'/>
</auth>
<source protocol='rbd' name='estack/new-libvirt-image'>
<host name='X.X.X.X' port='6789'/>
</source>
<target dev='vdb' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
</disk>
my host OS is Ubuntu, kernel 3.11.0-12-generic, the kvm-qemu is 1.5.0+dfsg-3ubuntu5.4, the guest os is Ubuntu 13.11
ceph version is 0.80.1 (a38fe1169b6d2ac98b427334c12d7cf81f809b74)
no performance improvements using the above cache settings, So what's wrong with me, please help, thanks!
Jian Li
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