Working on it.
Matt
Daniel Wood wrote:
Hi all,
I am looking into implementing OpenAFS over a network comprised mainly
of Windows clients. Having installed v1.3.84 on a Linux server, the
system is working fine so far. The ability to manipulate volumes
(such as moving between servers) to such an extent is particularly useful!
I was wondering what the progress was as regards byte-range locking.
Having searched a lot on the subject of file locking (and having had
to learn a few things!), I have determined that OpenAFS utilises
advisory whole-file locking but not byte-range locking. Thus Windows
applications such as Microsoft Office which utilise byte-range locking
are very dangerous on an AFS network due to the fact that two
applications can read/write to a file. As an aside, why do Office
apps use byte-range locking when they effectively lock the whole file?
Having looked at archived mailing list messages referring to Stage 1/2
locking in AFS, I was curious as to the status of any work so far?
Ideally (and assuming I'm vaguely right!) a mechanism whereby a file
is locked on the server to prevent writes (and either reads as well or
notifying the user the file is read-only as per Office) whilst
enabling byte-range locks in the cache would suit our purposes, since
we use shared drives where multiple users will access documents but
must not be allowed to change them at the same time. This I believe
is referred to as Stage 1?
I get the impression that work on this would be at a tangent to the
way AFS works, however that Stage 1 is feasible?
Any corrections to my technical knowledge are most welcome, and any
thoughts on a timescale in which this might be done if it can be done
would be nice (though I do realise that's a hard thing to answer!).
Without implementation of this feature I don't think we will be able
to use OpenAFS which is a shame because it does it's job well! I
don't think we can risk the possible loss of information it could
cause, even if it is a somewhat unlikely prospect.
Thanks for your time,
Dan
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