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Date: Thu, 17 May 2012 16:51:34 -0700
From: Stuart Kendrick <skendric@fhcrc.org>
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To: Chuck Lever <chuck.lever@oracle.com>
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Subject: Re: ls stalls
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> The file must reside in the directory you are listing, and it should be very large.  Typically dd'ing zeroes into a large file is a good way to starve non-writers.

Thanx Chuck.  I can replicate the problem, I've learned a lot about
dirty_bytes/dirty_ratio and I'm on my way to resolving this.

--sk