Re: [NFS] How to set-up a Linux NFS server to handle massive number of requests

[Tom Tucker <tom@opengridcomputing.com>]

On Tue, 2008-04-15 at 07:42 +0200, Carsten Aulbert wrote:
> 
> Tom Tucker wrote:
> > Maybe this this is a TCP_BACKLOG issue?
> > 
> 
> Hmm, Google does not yield much information about this. I think I know 
> what that would be, is there a cure or some kernel switches for tuning that?
> 
> > BTW, with that many mounts won't you run out of "secure" ports (< 1024),
> > so you'll need to use 'insecure' as a mount option.

> Not to my knowledge. All connections go to a single port onto the server 
> box (well, one port per service).  Only the clients may run out of 
> privileged ports of they do too much mounting, but mostly this option is 
> just for "security" reasons. At least that's my understanding.

Yes, you're right...I was being dumb here. Sorry. 

> 
> By the ways, discussing this issue with my colleague cluster admins, the 
> question popped up, if there is a guideline/rule of thump of how many 
> nfsd one should run - or asking the other way round, how to arrive at a 
> good compromise.
> 
> Our server boxes are pretty big (8 cores, 16 GB memory, 16 disk 
> Areca1261 RAID6), so the resources used by the nfsd are not much of an 
> issue - I even tested with 1024 nfsd idling around. AT some point 
> increasing the number does not make much sense because I cannot get the 
> data out fast enough or the seeks will likely "kill" the box^Wperformance.
> 
> Any thoughts on that?
> 
> Cheers
> 
> Carsten
> 
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