[OpenAFS] Re: Afsd and connection timeout

nicolas prochazka prochazka.nicolas@gmail.com
Mon, 6 Jan 2014 20:23:16 +0100

thanks for this information.
i can try it.

Nicolas Prochazka

2014/1/6 Andrew Deason <adeason@sinenomine.net>:
> On Thu, 26 Dec 2013 23:15:02 +0100
> nicolas prochazka <prochazka.nicolas@gmail.com> wrote:
>> I need some help to understand how afsd works with openafs server
>> crash.
> Sorry that you haven't gotten a lot of response; some people (like
> myself) were probably distracted during the holidays.
>> 3 - I can use data on my client without problem but after a random
>> period, I get :
>> Connection timed out. ( it's readonly acces )
>> I do not understand what is this random period, and if i can set it .
>> I do similary test with discon mode off, without success
> I'm not sure if it's clear yet to you from the other emails, but "fs
> discon" is a little broken. There are no setting for this, since it's
> supposed to just generally work. Getting this to work adequately for you
> is going to involve fixing it; disconnected mode is not a
> "production-ready" feature. But from your other thread I gather you're
> just asking if there's a constant in the code you can tweak, so...
> Some others in the other thread guessed that the problem you may be
> hitting is that we're evicting volume metadata from the cache. _IF_ that
> is the problem you're hitting, that should happen after 2 hours. If you
> have indeed seen it happen after 3 hours (that is, it still worked after
> 2 hours had passed) then I don't know, maybe something else is
> happening. But to hack the code to work around it:
> In src/afs/afs_cbqueue.c, function afs_QueueCallback, you can set
> avp->expireTime to some constant time in the future, instead of the
> actual assignment. This is an absolute Unix timestamp, not a relative
> time like "2 hours from now" or something. Don't set it close to 2^31 or
> some calculations will probably overflow. Maybe set it to 2000000000,
> which is some time in 2033.
> You could also try to modify afs_ResetVolumeInfo in src/afs/afs_volume.c
> to do nothing. Just comment out the contents of the function, or
> "return;" right at the beginning or something.
> Of course, doing either of those things will cause the client to never
> detect volume location changes by itself, even if disconnected mode is
> off. Doing that is not recommended for any production use and voids your
> warranty :) I'm not really sure if it will help you either, but it's
> something to try.
> --
> Andrew Deason
> adeason@sinenomine.net
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