linux-kernel - Re: [NFS] blocks of zeros (NULLs) in NFS files in kernels >= 2.6.20

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Message-ID: <20080922173715.GE12483@merfinllc.com>
Date:	Mon, 22 Sep 2008 10:37:15 -0700
From:	Aaron Straus <aaron@...finllc.com>
To:	chucklever@...il.com
Cc:	Trond Myklebust <trond.myklebust@....uio.no>,
	Hans-Peter Jansen <hpj@...la.net>,
	linux-kernel@...r.kernel.org, Neil Brown <neilb@...e.de>,
	Linux NFS Mailing List <linux-nfs@...r.kernel.org>
Subject: Re: [NFS] blocks of zeros (NULLs) in NFS files in kernels >= 2.6.20

Hi,

On Sep 22 01:26 PM, Chuck Lever wrote:
> Why can't you use O_SYNC | O_APPEND ?

In our case, some of the writers are not in our control.  Another case
we see the issue is you spawn a job:

   job 1> out 2> err &
   tail -f out err

--

Also, we actually do like caching the writes (b/c log files do not need
to be checked immediately after being written).   We just wish the cache
could be written out in-order.

If there's no way to make that happen... we can reorganize our
file-system, exports, mounts, etc so that the log file directory is
mounted with the sync option.   

However, the problem *might* be annoying and wide-spread enough to
warrant a change.

Anyway, thanks!

				Regards,
				=a=

-- 
===================
Aaron Straus
aaron@...finllc.com
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