From: Greg Lindahl <lindahl@keyresearch.com>
To: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: nfs@lists.sourceforge.net, linux-ha@muc.de
Subject: Re: Re: NFS as a Cluster File System.
Date: Fri, 10 Jan 2003 09:38:20 -0800 [thread overview]
Message-ID: <20030110173820.GA3066@wumpus.attbi.com> (raw)
In-Reply-To: <shs3co1kq1e.fsf@charged.uio.no>
> > I think this can be resolved with the "noac" mount option
> > (prior to V4).
>
> Nope. It can only be resolved using file locking.
There are 2 consistency problems: metadata and data.
Metadata is solved by noac. And yes, some MPI programs do things like
"node 0 writes out a bunch of files, then tells all the other nodes to
read one file each." This means that you have about 1/100 of a second
window between creation on one client and reading on a different client.
Data consistency is solved by file locking.
-- greg
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next prev parent reply other threads:[~2003-01-10 17:35 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-09 22:51 Re: NFS as a Cluster File System Lorn Kay
2003-01-10 15:01 ` Trond Myklebust
2003-01-10 17:38 ` Greg Lindahl [this message]
2003-01-12 21:23 ` Trond Myklebust
-- strict thread matches above, loose matches on Subject: below --
2003-01-14 16:01 Lever, Charles
2003-01-10 17:19 Lorn Kay
2003-01-12 21:29 ` Trond Myklebust
2003-01-10 14:51 Lever, Charles
2003-01-10 15:23 ` Brian Tinsley
2003-01-09 23:13 Lorn Kay
2003-01-09 23:45 ` Donavan Pantke
2003-01-09 19:39 Lorn Kay
2003-01-09 21:11 ` Brian Tinsley
2003-01-09 22:04 ` Brian Jackson
2003-01-09 23:02 ` Brian Tinsley
2003-01-09 21:29 ` Alan Robertson
2003-01-13 19:36 ` Neil Brown
2003-01-13 20:25 ` David B. Ritch
2003-01-13 20:40 ` Neil Brown
2003-01-13 20:50 ` David B. Ritch
2003-01-13 22:11 ` Neil Brown
2003-01-14 15:46 ` Trond Myklebust
2003-01-14 16:01 ` Kumaran Rajaram
2003-01-14 16:08 ` Trond Myklebust
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