NFS limits?

NFS limits?

[Marten Lehmann]

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


-------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
_______________________________________________
NFS maillist  -  NFS@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/nfs

Re: NFS limits?

[J. Bruce Fields]

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.


-------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
_______________________________________________
NFS maillist  -  NFS@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/nfs

Re: NFS limits?

[Ramon van Alteren]

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.





-------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
_______________________________________________
NFS maillist  -  NFS@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/nfs