Date: Thu, 12 Jan 2012 16:24:41 -0800 From: Kirk McKusick <mckusick@mckusick.com> To: freebsd-fs@freebsd.org Cc: bryce@bryce.net, Gautam Mani <gautam@execve.net> Subject: Re: FS hang when creating snapshots on a UFS SU+J setup Message-ID: <201201130024.q0D0OflU055874@chez.mckusick.com> In-Reply-To: <20120111103039.d342aef4.lists@yamagi.org>
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Hi all, With a gentle reminder from Peter Holm that he has a test that demonstrates this problem and the additional examples provided by several of you, I can now reliably reproduce the problem. Having spent a day trying to get to the bottom of it, I have decided that it is a `hard problem' which is going to require some time to figure out. I am hopeful that Jeff will come up with some time to help out here, but know that he is rather busy on other projects at the moment. My conclusion is that as an interim solution, we disable the ability to request snapshots on filesystems that are using SU+J. Notably, if a snapshot is attempted, the request fail with a message that reports that snapshots are currently supported only on systems running with SU. I think that this would be far preferable to the current situation. Does this seem like a reasonable approach? Kirk McKusick
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