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Re: [Xen-users] High availability and live migration with just LVMand ha

To: Bart Coninckx <bart.coninckx@xxxxxxxxxx>
Subject: Re: [Xen-users] High availability and live migration with just LVMand hardware fencing
From: John Madden <jmadden@xxxxxxxxxxx>
Date: Thu, 20 May 2010 11:24:23 -0400
Cc: Jeff Sturm <jeff.sturm@xxxxxxxxxx>, "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>, Javier Guerra Giraldez <javier@xxxxxxxxxxx>
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Note Jeff's note on SAN snapshots and gfs_tool.  His snapshots work
because the OS is made aware of the need to flush caches and temporarily
queue writes to the disk.

John


Would a "xm suspend" before the snapstho not accomplish this?

I think you mean "xm pause." That pauses or freezes the domain, but does nothing more to it. Anything in memory on the guest remains in memory, not flushed to disk. You need something inside the guest that tells the kernel to flush everything, fsyncs, etc., then makes no further changes to the filesystem until un-frozen.

John




--
John Madden
Sr UNIX Systems Engineer
Ivy Tech Community College of Indiana
jmadden@xxxxxxxxxxx

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