Re: advice on tuning sol8 nfs servers
From: CJT (abujlehc_at_prodigy.net)
Date: 07/07/05
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Date: Thu, 07 Jul 2005 04:03:14 GMT
Steven C. Liu wrote:
> Hi,
>
> I work for a very large US financial services firm, and lately we've
> noticed a huge performance hit when accessing our NFS volumes. Our log
> files show copious "NFS server not responding" messages. This is very
> worrisome when the financial markets are open. Any advice on how to
> maximize NFS performance is appreciated.
>
> Some info on our environment:
> 1. We use VCS to manage the disk volumes as well as the server-side NFS
> processes.
> 2. Our clients mount from the NFS servers using the logical names, not
> the physical - i.e., logical, for VCS failover for HA.
> 3. Our disk volumes are huge - e.g., a single 1.5 TB disk group (from
> too many 25 GB LUNs from Sym EMC storage) divided into 3 logical volumes.
> 4. Our NFS servers are Sol8, but we can use a different OS/platform if
> there is a convincing argument for it. The h/w are real server-class
> platforms, not headless desktops.
> 5. Our clients are predominantly Linux (RHES3) on powerful HP PC's; we
> also see problems with our Sol2.6/Sol8/Sol9 clients (running on modern
> h/w platforms).
>
> Suggestions can be anything relevent: kernel params, mount settings, #
> of nfsd procs, volume size, OS, hardware platform, # of clients per
> server, etc. Anything.
>
> TIA,
>
> Steve
Some thoughts ...
Are you sure it's the servers and not a bottleneck in the network?
Pretty much the only time I see those messages is when I have a link
that's failed/failing. I think the clients try for quite a while
before giving up.
What do your CPU and I/O utilization numbers on the server(s) look like?
Do the machines have enough memory?
From your description it sounds like the problem didn't always exist --
what has changed?
I think Solaris 9 made some significant improvements over 8, but you'd
need to do a careful study of your particular situation before shifting.
Solaris 10 promises still more enhancements, but is still relatively
new.
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