NFSLinux Clients AIX Servers

[John Miles]

Forgot to add - the nfs options in /etc/fstab on the clients are:

"timeo=100,retrans=5,soft,intr,bg,suid,rw,nolock"

John

On Wed, Feb 11, 2009 at 4:24 PM, John Miles <jmiles242-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org> wrote:

> Thank you for the reply Len,
>
> In our case they are AIX boxes using NFS 3 using soft mounts.
> The permissions are being granted via netgroup files also.
> To give you an idea of how big this situation is - all of our Linux client
> machines have /etc/fstabs that are longer than 200 lines..... which is a big
> problem in its self.
> I am counting the mounts timing out on one of the AIX boxes - it is at *
> mount_name*28 (i.e. that server has mounts starting with 1 to at least
> 28).
> (yikes)
>
> John
>
>
> On Wed, Feb 11, 2009 at 4:11 PM, Lennart Sorensen <
> lsorense-1wCw9BSqJbv44Nm34jS7GywD8/FfD2ys at public.gmane.org> wrote:
>
>> On Wed, Feb 11, 2009 at 03:38:55PM -0500, John Miles wrote:
>> > Hi,
>> > Last night Drew was kind enough to provide me with a pretty cool
>> solution to
>> > a problem we're having (NFS proxy)
>> > (4 AIX boxes serving up dozens of NFS exports each to a couple of
>> thousand
>> > machines.... and somehow everytime a mass of machines try to mount them,
>> > apparently the client's do not time out and begin hammering the NFS
>> > servers).
>> >
>> > I'd like to try and understand why the problem actually happens - and
>> the
>> > answer could simply be - AIX won't use standardized NFS, but wondering
>> if
>> > there is a definitive answer.
>> >
>> > Thanks for the info - and the post-meeting suds!
>>
>> Well NFS has lots of variations.
>>
>> V2, V3, V4, tcp or udp, soft versus hard, interruptable, etc.
>>
>> Different assumptions are made by clients and servers, and perhaps when
>> lots of clients connect at once, if they use UDP you end up with dropped
>> packets, and then lots of delays and timeuts and retries for a while.
>>
>> --
>> Len Sorensen
>> --
>> The Toronto Linux Users Group.      Meetings: http://gtalug.org/
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>
>
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