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SubjectRe: Red Hat needs this patch (was Re: handling NFSERR_JUKEBOX)


On 6 Nov 2001, Trond Myklebust wrote:

> >>>>> " " == Bob Smart <smart@hpc.CSIRO.AU> writes:
>
> >> Take a look at the nfs sourceforge mailing list. There's a
> >> long thread about this in the context of a Solaris HSM server.
> >> I wrote a patch to try to do the right thing on a linux client,
> >> but it is not perfect for many reasons:
> >> http://devrandom.net/lists/archives/2001/6/NFS/0135.html
>
> > Thanks again for this patch. I've appended our current version
> > to save others the trouble of minor modifications. I've just
> > tested it against 2.4.13-ac7.
>
> > Your patch may not be perfect but it is a million times better
> > than nothing. We have had no problems with it. Linux has a long
> > tradition of utilizing imperfect software till something better
> > comes along.
>
> > This patch is ESSENTIAL to make Linux useable in large
> > enterprises, because they increasingly commonly utilize
> > hirearchically managed storage. I strongly urge
> > Alan/Linus/Macello to include this patch in the stable kernel
> > tree (but marked experimental). Or at least can the kernel
> > maintainers at Red Hat and other distributions put it in their
> > offerings: surely you see that you need this for your big
> > customers.
>
> The patch may appear to work, but it fails to understand the nature of
> the problem. The problem with NFSERR_JUKEBOX is that is can appear in
> more or less *any* NFSv3 RPC call. That includes everything from
> lookups to writes.
>
> If all you do is intercept read and setattr, then you certainly
> haven't achieved 'enterprise quality'.

Trond,

Should'nt we make Linux retry on NFSERR_JUKEBOX _by default_ ?

Is there any reason why we already don't do that already except "nobody
coded it yet" ?

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