[sheepdog-users] The iscsi performance

李文涛 liwentao988 at 163.com
Mon Mar 30 05:05:40 CEST 2015

When I test the performance without option  '-n'.
From the client to server's disks, I analyze the client cpu, the iscsi networks environment, the server cpu, the server disks.
The client have more than 50% wait, the rest is idle.
The iscsi networks environment is via 10GbE.
The server cpu is more than 95% idle.
The server disks is just 5% utilization.
So I means can sheepdog make maxmize use of the hardware?
And my environments have much more hardware resource for sheepdog to use.

At 2015-03-30 10:12:41, "李文涛" <liwentao988 at 163.com> wrote:
Hi Valerio,
Sorry for reply so late.
I saw the option '-n' is 'drop O_SYNC for write of backend'. I think it can only improve write performance.And it could make my data danger.
And have you test the performance? How are them?
My cluster is 2 nodes.And the copies is 2.

[root at server240 ~]# dog cluster info
Cluster status: running, auto-recovery enabled
Cluster created at Fri Mar 20 18:13:00 2015
Epoch Time Version
2015-03-27 15:15:33 131 [,]

[root at server240 ~]# dog vdi list
Name Id Size Used Shared Creation time VDI id Copies Tag
dog8 0 100 GB 100 GB 0.0 MB 2015-03-27 10:26 e94b23 2

At 2015-03-28 18:12:21, "Valerio Pachera" <sirio81 at gmail.com> wrote:

2015-03-27 11:17 GMT+01:00 李文涛 <liwentao988 at 163.com>:

Have sameone test the performance of iscsi ?

Is sheep daemon running with option '-n' ?

If not, stop your cluster and this option.

How many copies is you cluster using?

If you run 'dog cluster format' without argument it's keeping 3 copies.

If the cluster is small, you may use 2 copies and it will be faster.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.wpkg.org/pipermail/sheepdog-users/attachments/20150330/0a75f2a5/attachment-0005.html>

More information about the sheepdog-users mailing list