Performance Tuning Recommendations for a RHEL 4 NFS Fileserver

Stephen John Smoogen smooge at
Fri Dec 1 11:03:18 CST 2006

On 12/1/06, Mansell, Gary <Gary.Mansell at> wrote:
> Dear all,
> I am about to implement a Dell PE2950 with 4GB RAM attached to an MD1000
> array with a 15 300GB SAS Drives in a RAID 5 config via a PERC5/e card.
> The machine is to act as an NFS fileserver for about 100 UNIX and Linux
> machines and also as a Samba Server for about 100 PC's.
> I would be interested to hear any recommendations as to tuning
> parameters that I should incorporate into the configuration.
> I expect to increase the number of nfsd's from the default 8 to 16 (will
> this be enough?), will mount with noatime, will tune2fs the filesystem
> so that it does not get automatically fscked at boot.
> Are there any other NFS tuning ideas, IO subsystem tuning and Network
> Tuning Parameters that I should consider?

NOTE: I have not tested this myself.

>From what I can tell on other Linux mailling lists, you will want to
avoid LVM/LVM2 as a subfilesystem on the partition you are exporting.
Instead use a direct ext3 partition on this hardware. Also  making
sure that the RAID cache is set appropriately for async/sync helps
greatly also.

Stephen J Smoogen. -- CSIRT/Linux System Administrator
How far that little candle throws his beams! So shines a good deed
in a naughty world. = Shakespeare. "The Merchant of Venice"

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