From mboxrd@z Thu Jan  1 00:00:00 1970
From: Joe Thornber <thornber@redhat.com>
Subject: Re: dm-cache coherence issue
Date: Mon, 26 Jun 2017 12:33:42 +0100
Message-ID: <20170626113341.GA20683@nim>
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To: Johannes Bauer <dfnsonfsduifb@gmx.de>
Cc: device-mapper development <dm-devel@redhat.com>
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On Sat, Jun 24, 2017 at 03:56:54PM +0200, Johannes Bauer wrote:
> So I seem to have a very basic misunderstanding of what the cleaner
> policy/dirty pages mean. Is there a way to force the cache to flush
> entirely? Apparently, "dmsetup wait" and/or "sync" don't do the job.

Your understanding is correct.  There is a tool in the latest thinp
tools release called cache_writeback that does offline decommissioning
of a cache.

I'll try and reproduce your scenario and get back to you.

- Joe