I'm afraid I can't give you any pointers...hopefully someone with ceph tuning
expertise could comment.
(You might try the ceph mailing list at [email protected])
Chris
On 08/25/2017 01:30 AM, [email protected] wrote:
I use this command to launch a VM. It disk io is also about 20M Bps，Why？
/usr/libexec/qemu-kvm -m 1024 -drive
format=rbd,file=rbd:volumes/d9bda7d7-f68a-45ea-84a1-f50faa44b801_disk,cache=writeback
-vnc :10 -usb -usbdevice tablet
Thanks！
--------------------------------------------------------------------------------
[email protected]
*From:* [email protected] <mailto:[email protected]>
*Date:* 2017-08-25 10:05
*To:* Chris Friesen <mailto:[email protected]>; openstack
<mailto:[email protected]>
*Subject:* Re: Re: [Openstack] guest rbd block device speed limit
This is my ceph performance data:
Total time run: 30.370630
Total writes made: 849
Write size: 4194304
Bandwidth (MB/sec): 111.819
Stddev Bandwidth: 21.6665
Max bandwidth (MB/sec): 124
Min bandwidth (MB/sec): 0
Average IOPS: 27
Average Latency(s): 0.572236
Stddev Latency(s): 0.421846
Max latency(s): 4.06547
Min latency(s): 0.121321
Thanks!
--------------------------------------------------------------------------------
[email protected]
*From:* Chris Friesen <mailto:[email protected]>
*Date:* 2017-08-24 23:14
*To:* [email protected]
<mailto:[email protected]>
*Subject:* Re: [Openstack] guest rbd block device speed limit
On 08/24/2017 01:04 AM, [email protected] wrote:
> Hello:
> I am using openstack + libvirt + qemu-kvm. The speed of copying
files
> between virtual machines exceeds 300M Byte per second but the speed
of dd command:
> "watch dd oflag=direct,nonblock if=/dev/zero of=/opt/iotest1 bs=4M
count=10"
> is around 20M byte per second. Every guest is the same, and there
is no io
> tuning in libvirt. What can I do to unleash the speed of disk io
speed inside
> the guest?
> Thanks!
It looks like you're using ceph for your root disk. What sort of
performance do
you get accessing the ceph volumes from the host?
Chris
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