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

[John Madden <jmadden@xxxxxxxxxxx>]

> > 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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