Re: [PROBLEM] NFS trouble - file corruptions

[Rasmus Bøg Hansen]

On Thu, 28 Nov 2002, Trond Myklebust wrote:

> >>>>> " " == Rasmus Bøg Hansen <[e-mail]> writes:
>
>     >> Does it also occur if you play around with setting rsize and
>     >> wsize = 1024?
>
>      > I'm afraid so - I just double-checked...
>
> Given that you are saying that even synchronous RPC (which is the
> default for r/wsize = 1024) is failing, then my 2 main suspicions are
>
>   - hardware failure: Have you tried this on several different
>     server/client combinations and hardware combinations?

Sigh:

Just tried reversing the process (ie. exchanging the client/server
role): No trouble at all, no errors in files.

I just tried turning off DMA on the server disk (this is just a low-end
IDE-system): No errors in files (compressing the file thrice).

So it does not at all seem to be a NFS-issue!

I have no idea what is wrong. If the disk, cable or IDE controller does
bit-flipping when DMA is turned on, why is the problem only seen with
NFS? I have never seem corrupted files or metadata with DMA turned
(except once long ago, when I experimented with high-transfer-modes - I
haven't done that since)...

Thanks for your help!

Regards
/Rasmus

(damn, PIO-mode performance sucks!)

-- 
-- [ Rasmus "Møffe" Bøg Hansen ] ---------------------------------------
He who asks a question is a fool for five minutes; he who does not ask a
question remains a fool forever.
----------------------------------[ moffe at amagerkollegiet dot dk ] --