[OpenAFS] enobufs, "No buffer space available" messages

[Jeffrey Altman]

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Since 1.6.5 a change was made to the client to translate the VNOSERVICE
error to ETIMEDOUT.  That doesn't change any behavior but it results in
a more reasonable error message being reported.  (VNOSERVICE has the
same numeric value as ENOBUFS.)

In 1.6.2 a change was made to the client to treat a VNOSERVICE error as
a condition which permits a retry of the operation.  However as the
e-mail thread you quoted from indicates, doing so is not always safe.

What version is the client?

Jeffrey Altman


On 7/11/2014 8:13 PM, Renata Maria Dart wrote:
> Hi, I found some earlier discussion on openafs about this error
> message popping out, it seems when a transaction has taken "longer"
> than expected.  I couldn't find anything though that described a
> "fix".  Is there a fix?  Or is the fix to get a faster server?  :-)
> The discussion that I am referring to took place in October of last yea=
r
> with the subject "No buffer space available" reported by Stephan
> Wiesand.
>=20
> This is the last of the discussion that I have found:
>=20
>   As has been pointed out to me, this has been in 1.6 for a while. Sorr=
y;
>   I thought I checked, but I was looking at the 'git log' for an older
>   version.
>=20
>   Same thing, though. With 8462 we retry on VNOSERVICE errors, but the
>   CreateFile operation is not idempotent, so we can't retry it. We
>   probably should retry CreateFile operations, and swallow an EEXIST er=
ror
>   if it doesn't matter (file was created without O_EXCL). And/or we rea=
lly
>   shouldn't let VNOSERVICE propagate to userspace.
>=20
>   > > I assume this was hanging for a little while before erroring out,=

>   > > yes?
>   >=20
>   > Sorry, I really can't tell. When you copy files around a quarter of=

>   > the globe, there are always delays. And as usual, I fired the comma=
nd
>   > and then went on to something else. I'm fairly sure it didn't hang =
for
>   > more than about a minute though.
>=20
>   "About a minute" I think is enough for this.
>=20
> We are running 1.6.5 fileservers and we are seeing this error
> message appear intermittently from a script that updates
> links in AFS space.  It comes out at the time the script attempts
> to remove a lock file.
>=20
> Thanks,
>=20
> Renata
> _______________________________________________
> OpenAFS-info mailing list
> OpenAFS-info@openafs.org
> https://lists.openafs.org/mailman/listinfo/openafs-info
>=20


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