发件人： Haomai Wang发送时间： 2014-10-31 09:59收件人： 廖建锋抄送： ceph-users; ceph-users主题： Re: Re: [ceph-users] 回复: half performace with keyvalue backend in 0.87Thanks, recently I mainly focus on rbd performance for it(random small write).
I want to know your test situation. Is it seq write?
On Fri, Oct 31, 2014 at 9:48 AM, 廖建锋 <Derek@xxxxxxxxx> wrote:
> which i can telll is :
> in 0.87 , osd's writting under 10MB/s ,but io utilization is about 95%
> in 0.80.6, osd's writting about 20MB/s, but io utilization is about 30%
>
> iostat -mx 2 with 0.87
>
> Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm
> %util
> sdb 0.00 43.00 9.00 85.50 0.95 1.18 46.14 1.36 14.49 10.01 94.55
> sdc 0.00 37.50 6.00 99.00 0.62 10.01 207.31 2.24 21.31 9.33 97.95
> sda 0.00 3.50 0.00 1.00 0.00 0.02 36.00 0.02 17.50 17.50 1.75
>
> avg-cpu: %user %nice %system %iowait %steal %idle
> 3.16 0.00 1.01 17.45 0.00 78.38
>
> Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm
> %util
> sdb 0.00 36.50 0.00 47.50 0.00 1.09 47.07 0.82 17.17 16.71 79.35
> sdc 0.00 25.00 15.00 77.50 1.26 0.65 42.34 1.73 18.72 10.70 99.00
> sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
>
> 发件人： Haomai Wang
> 发送时间： 2014-10-31 09:40
> 收件人： 廖建锋
> 抄送： ceph-users; ceph-users
> 主题： Re: [ceph-users] 回复: half performace with keyvalue backend in 0.87
>
> Yes, it exists persistence problem at 0.80.6 and we fixed it at Giant.
> But at Giant, other performance optimization has been applied. Could
> you tell more about your tests?
>
> On Fri, Oct 31, 2014 at 8:27 AM, 廖建锋 <Derek@xxxxxxxxx> wrote:
>> Also found the other problem is: the ceph osd directory has millions
>> small
>> files which will cause performance issue
>>
>> 1008 => # pwd
>> /var/lib/ceph/osd/ceph-8/current
>>
>> 1007 => # ls |wc -l
>> 21451
>>
>> 发件人： ceph-users
>> 发送时间： 2014-10-31 08:23
>> 收件人： ceph-users
>> 主题： [ceph-users] half performace with keyvalue backend in 0.87
>> Dear Ceph,
>> I used keyvalue backend in 0.80.6 and 0.80.7, the average speed with
>> rsync millions small files is 10M byte /second
>> when i upgrade to 0.87(giant), the speed slow down to 5M byte /second, I
>> don't why , is there any tunning option for this?
>> will superblock cause those performance slow down?
>>
>>
>>
>>
>> _______________________________________________
>> ceph-users mailing list
>> ceph-users@xxxxxxxxxxxxxx
>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>>
>
>
>
> --
> Best Regards,
>
> Wheat
--
Best Regards,
Wheat
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