[sheepdog-users] The iscsi performance

[李文涛]

OK,I drop O_SYNC, The performance have improved much.
Thank you!!!








At 2015-03-30 16:40:13, "Hitoshi Mitake" <mitake.hitoshi at lab.ntt.co.jp> wrote:
>At Mon, 30 Mar 2015 11:05:40 +0800 (CST),
>李文涛 wrote:
>> 
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>> 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.
>
>Could you provide the detail of your environment? e.g. how many sheep nodes, iSCSI initiator and its OS, fio parameters, network topology, etc.
>
>Thanks,
>Hitoshi
>
>> 
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>> 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 [192.168.200.227:7000, 192.168.200.240:7000]
>> 
>> [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:
>> 
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>> 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.
>> 
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