[one-users] NFS performance tuning

[Peter Farič]

Hi!


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?


Thanks!

-- 

LP,
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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
Slovenija
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