Re: performance degradation issue

["Khanh. Nguyen Dang Quoc" <khanhndq@xxxxxxxxxx>]

Hi Greg,

 

It’s the write  benchmark..

 

Regards

Khanh

 

From: Gregory Farnum [mailto:greg@xxxxxxxxxxx]
Sent: Thursday, May 23, 2013 10:56 AM
To: Khanh. Nguyen Dang Quoc
Cc: ceph-users@xxxxxxxxxxxxxx
Subject: Re: performance degradation issue

 

What's the benchmark?

-Greg

On Wednesday, May 22, 2013, Khanh. Nguyen Dang Quoc wrote:

Dear all,

 

now i faced one issue in ceph block device: performance degradation

 

ceph version 0.61.2 (fea782543a844bb277ae94d3391788b76c5bee60)

ceph status

 

health HEALTH_OK

monmap e1: 2 mons at {a=49.213.67.204:6789/0,b=49.213.67.203:6789/0}, election epoch 20, quorum 0,1 a,b

osdmap e53: 2 osds: 2 up, 2 in

pgmap v535: 576 pgs: 576 active+clean; 11086 MB data, 22350 MB used, 4437 GB / 4459 GB avail

mdsmap e29: 1/1/1 up {0=a=up:active}, 1 up:standby

 

I do benchmark with one osd, I receive the io speed is about 190MB/s

 

But When i add more osd, replicate size =2 , the write performance degradated is about 90MB/s

 

Follow the pratice, the write performance must be increated as adding more osd but I can't receive that. :(

anyone can you help me check what's wrong in config file or anything else?

 

Regards,

Khanh Nguyen

--
Software Engineer #42 @ http://inktank.com | http://ceph.com

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