|
Thanks for your information, but I don't think it is my case.My cluster
don't have any ssd.
发件人：Denes Dolhay <denke@xxxxxxxxxxxx>
发送时间：2017-12-18 06:41
主题：Re: [ceph-users] [Luminous 12.2.2] Cluster peformance
drops after certain point of time
收件人："ceph-users"<ceph-users@xxxxxxxxxxxxxx>
抄送：
Hi,
This is just a tip, I do not know if this actually applies to you, but some
ssds are decreasing their write throughput on purpose so they do not wear out
the cells before the warranty period is over.
Denes.
On 12/17/2017 06:45 PM, shadow_lin wrote:
Hi All,
I am testing luminous 12.2.2 and find a
strange behavior of my cluster.
I was testing my cluster
throughput by using fio on a mounted rbd with follow fio parameters:
fio -directory=fiotest
-direct=1 -thread -rw=write -ioengine=libaio -size=200G -group_reporting
-bs=1m -iodepth 4 -numjobs=200 -name=writetest
Everything was fine at the begining, but after about 10 hrs of testing I
found the performance dropped noticeably.
Throughput droped from 300-450MBps to 250-350MBps and osd latency
increased from 300ms to 400ms
I
also noted the heap stats showed the osd start
reclaiming page heap freelist much more frequently but the rss
memory of osd were increasing.
below is the links of grafana graph of my cluster.
In the graph the performance
dropped after 10:00.
I am investigating what happened but haven't
found any clue yet. If you know any thing about how to solve this
problem or where I should look into please let me know.
Thanks.
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