Re: Ceph performance pattern

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Thanks Somnath. 

 

I am running with CentOS7.2.  Have you seen this pattern before?

 

- epk

 

From: Somnath Roy [mailto:Somnath.Roy@xxxxxxxxxxx]
Sent: Tuesday, July 26, 2016 4:44 PM
To: EP Komarla <Ep.Komarla@xxxxxxxxxxxxxxx>; ceph-users@xxxxxxxxxxxxxx
Subject: RE: Ceph performance pattern

 

Which OS/kernel you are running with ?

Try setting bigger read_ahead_kb for sequential runs.

 

Thanks & Regards

Somnath

 

From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of EP Komarla
Sent: Tuesday, July 26, 2016 4:38 PM
To: ceph-users@xxxxxxxxxxxxxx
Subject: Ceph performance pattern

 

Hi,

 

I am showing below fio results for Sequential Read on my Ceph cluster.  I am trying to understand this pattern:

 

- why there is a dip in the performance for block sizes 32k-256k?

- is this an expected performance graph?

- have you seen this kind of pattern before

 

 

My cluster details:

Ceph: Hammer release

Cluster: 6 nodes (dual Intel sockets) each with 20 OSDs and 4 SSDs (5 OSD journals on one SSD)

Client network: 10Gbps

Cluster network: 10Gbps

FIO test:

- 2 Client servers

- Sequential Read

- Run time of 600 seconds

- Filesize = 1TB

- 10 rbd images per client

- Queue depth=16

 

Any ideas on tuning this cluster?  Where should I look first?

 

Thanks,

 

- epk

 


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