Hello,
a mailserver of us is storing the messages on another server with NFS
through TCP. A lot of concurrent deliveries occur, but I can only see
about 8 nfs processes on the storage server. The mailserver which
accesses the storage often has very high I/O waits (>400 seconds),
because the NFS server doesn't respond in time. How can I increase the
NFS-processes on the storage server? Right NFS is a real bottleneck and
a lot of mails are delivered with a delay of 1-3 hours.
Regards
Marten
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Hi,
On 8 May , 2006, at 7:43 PM, Marten Lehmann wrote:
> a mailserver of us is storing the messages on another server with
> NFS through TCP. A lot of concurrent deliveries occur, but I can
> only see about 8 nfs processes on the storage server. The
> mailserver which accesses the storage often has very high I/O waits
> (>400 seconds), because the NFS server doesn't respond in time. How
> can I increase the NFS-processes on the storage server? Right NFS
> is a real bottleneck and a lot of mails are delivered with a delay
> of 1-3 hours.
I'm personally using gentoo which offers a tunable parameter on how
many nfs deamons are started. I took a look in the init script that
starts the nfs server and it appears to be a single parameter that
you can supply to the nfs binary.
e.g. /usr/sbin/rpc.nfsd <no-of-nfs-processes>
AFAIK every client of the NFS server starts 4 nfs IOD (I/O deamons)
to handle nfs by default.
It's probably possible to increase that as well, no idea how though.
Hope that helps ?
Grtz Ramon
--
If to err is human, I'm most certainly human.
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On Mon, May 08, 2006 at 07:43:50PM +0200, Marten Lehmann wrote:
> Hello,
>
> a mailserver of us is storing the messages on another server with NFS
> through TCP. A lot of concurrent deliveries occur, but I can only see
> about 8 nfs processes on the storage server. The mailserver which
> accesses the storage often has very high I/O waits (>400 seconds),
> because the NFS server doesn't respond in time. How can I increase the
> NFS-processes on the storage server? Right NFS is a real bottleneck and
> a lot of mails are delivered with a delay of 1-3 hours.
See
http://nfs.sourceforge.net/nfs-howto/performance.html#NFSD-INSTANCE
and "man nfsd".
--b.
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