Christian,
Excellent performance improvements base on your guide,
I set so small rbd cache size before, so do not get any improvements using RBD
cache.
Thanks a lot!
Jian Li
At 2014-07-08 10:14:27, "Christian Balzer" wrote:
>
>Hello,
>
>how did you come up with those bizarre cache sizes?
Hello,
how did you come up with those bizarre cache sizes?
Either way, if you test with FIO anything that will significantly exceed
the size of the cache will have very little to no effect.
To verify things, set the cache values to be based around 2GB and test
with a FIO that is just 1GB in siz
Haomai Wang,
I use the FIO to test 4K and 1M read/write under iodepth=1 and iodepth=32 in VM
Do you know the improvements percentage using cache base on yourself test.
Thanks!
JIan Li
At 2014-07-08 08:47:39, "Haomai Wang" wrote:
>With info you provided, I think you have enabled rbd cache. As fo
Hi David,
I set the writeback in vm qemu definition
Thanks!
JIan Li
在 2014-07-08 08:47:24，"David" 写道：
Do you set cache=writeback in your vm’s qemu conf for that disk?
// david
8 jul 2014 kl. 14:34 skrev lijian :
Hello,
I want to enable the qemu rbd writeback cache, the following
With info you provided, I think you have enabled rbd cache. As for
performance improvement, it's related to your performance tests
On Tue, Jul 8, 2014 at 8:34 PM, lijian wrote:
> Hello,
>
> I want to enable the qemu rbd writeback cache, the following is the settings
> in /etc/ceph/ceph.conf
> [cl
Do you set cache=writeback in your vm’s qemu conf for that disk?
// david
8 jul 2014 kl. 14:34 skrev lijian :
> 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 =
