[one-users] NFS performance tuning

Peter Farič peter.faric at ledinek.com
Fri Jun 3 04:39:00 PDT 2011


I have the following test setup:

1 x ONE server with two Gbit ethernet cards (one for public and one for 
VM VLAN). /srv/cloud is mounted on an RAID10 md array with 4 SATA2 
disks. OS: RHEL6.0

2 x KVM node servers with two Gbit ethernet cards each (one for public 
and one for VM VLAN). OS: RHEL 6.0

As the NFS performance is not satisfactory for any VMs that have a lot 
of IO (MySQL, ...), I was wondering if you have any ideas how to boost 
NFS performance? In my case the VMs IOwait was most of the time in the 
70 - 90% with 2 - 6 MBytes write transfer rates.

At the moment the NFS clients mount the share with "noatime,nodiratime" 
options in fstab. I wouldn't want to enable "async" since its not "safe".

How do you tune your NFS mount so the performance becomes acceptable in 
medium to high IO environments?



Peter Farič
Sistemski administrator
Tel.:  +386 2 613 00 79
Fax :  +386 2 613 00 60
Email: peter.faric at ledinek.com
WWW:   http://www.ledinek.com
Ledinek Engineering d.o.o.
Bohovska cesta 19 A
SI-2311 HOČE

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