Daugherity, Andrew W wrote:
Message: 7
Date: Thu, 11 Aug 2011 21:07:00 +0000
From: "Daugherity, Andrew W" <adaugher...@tamu.edu>
To: "pacemaker@oss.clusterlabs.org" <pacemaker@oss.clusterlabs.org>
Subject: [Pacemaker] migration fix for ocf:heartbeat:Xen
Message-ID: <93b5e618-ad19-4993-8066-cb4f8e4ef...@tamu.edu>
Content-Type: text/plain; charset="us-ascii"
I have discovered that sometimes when migrating a VM, the migration itself will
succeed, but the migrate_from call on the target node will fail, as apparently
the status hasn't settled down yet. This is more likely to happen when
stopping pacemaker on a node, causing all its VMs to migrate away. Migration
succeeds, but then (sometimes) the status call in migrate_from fails, and the
VM is unnecessarily stopped and started. Note that it is NOT a timeout
problem, as the migrate_from operation (which only checks status) takes less
than a second.
I noticed the VirtualDomain RA does a loop rather than just checking the status
once as the Xen RA does, so I patched a similar thing into the Xen RA, and that
solved my problem.
(patch/logs snipped)
No comments? What does it take to get this patch accepted? I'd much rather
use the mainline version than have to reapply my patch after every HAE update.
I guess I could open an SR with Novell but this is ultimately an upstream issue.
I don't know about getting the patch accepted but since I've seen issues
like the one you describe on my systems, I have applied your patch
(Thanks!) and will see how it behaves.
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