[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Re: xen device migration
On Wed, Jul 30, 2008 at 12:16 AM, Mark Williamson <mark.williamson@xxxxxxxxxxxx> wrote: > On Tuesday 29 July 2008, you wrote: >> Hi Mark >> >> I have some queries on Xen Migration setup >> >> VM resource are provided using NFS, iSCSI, AoE. After following the >> below article http://archive.netbsd.se/?ml=xen-users&a=2007-12&t=6000155. >> It suggests that we can migrate the disk and swap images using >> external-device-migration. > > Heh, well it looks like I suggested that but I've never done it myself! I > believe it may be possible but it won't necessarily be efficient. > >> So it means that if we use the external-device-migrate script then all >> the shared reosurce methos are not required ? > > In *principle*, if I was right about the external device migration scripts > then it might eliminate the need for shared resources. But unless you added > some clever tricks then it would make live migration slower because of the > need to copy the data across. I think a good network-based disk solution > will perform better since the disk and swap will be available immediately > after the memory migration has been performed. > > >> How do i use this method (to migrate the machine with device >> migration)? > > Sorry, I don't know the details. I guess you'd have to write a script that > would do the device migration somehow (e.g. copying files across a network) > and get the migration system to call it. Sorry I can't be more specific. > >> Does xm migrate take care of using the device migration >> scripts if shared resource (NFS, AoE etc) are not used. > > Not automatically, you'd need to tell it to use the migration scripts. There > might be some example scripts in the Xen repository you could look at but > you'd probably have to do some customisation or possibly write your own. > >> or Am i missing something important. > > It's easy to set up Xend to automatically connect to nbd devices when a > migration occurs. Maybe you should consider that? > > In any case, you should take care to separate the migration traffic from the > VM's network somehow so that VMs can't snoop on the data transmitted by > migrations. thanks for all your helpful pointers. > > Cheers, > Mark -Tej > > -- > Push Me Pull You - Distributed SCM tool (http://www.cl.cam.ac.uk/~maw48/pmpu/) > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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