Re: [Xen-users] SAN / LVM backend and partitions

["Ulrich Windl" <ulrich.windl@xxxxxxxxxxxxxxxxxxxx>]

Reinhard,

for me the second method actually failed with SLES10 at that time because 
initrd/initfs was unable to mount the LVM root. I switched to the first method.

Regards,
Ulrich

On 19 Jan 2007 at 13:06, Reinhard Brandstaedter wrote:

> Hi,
> 
> I'm playing around with Xen using LVM2 based on a SAN storage for VBDs.
> Unfortunately I'm not very familiar with LVM2 but so far I get DomUs up
> and running with using a logical volume as disk.
> 
> What confuses me a bit is the two different ways how to use a logical
> volume.
> >From the XEN User Manual I see this procedure:
> - create logical volume
> - create filesystem on LV
> - copy system files (the LV is mountable in dom0)
> 
> Basically if you want multiple disks (or partitions for /usr,/var, ...)
> in the DomU you specify them in the vm config file and need to have
> multiple logical volumes on the Dom0 for that, like:
> /dev/vg0/vm-root
> /dev/vg0/vm-var
> /dev/vg0/vm-usr
> 
> However I can also only specify only one logical volume in the config
> file and do the partitioning in the DomU then. (e.g. if I use
> virt-install on RedHat). So the one logical volume would get a partition
> table?
> Calling fdisk on this volume would print something like that:
> # fdisk -l /dev/vg0/vm-root
> 
> Disk /dev/vg/vm-root: 6442 MB, 6442450944 bytes
> 255 heads, 63 sectors/track, 783 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> 
> Device             Boot  Start  End  Blocks    Id  System
> /dev/vg0/vm-root1  *     1      13   104391    83  Linux
> /dev/vg0/vm-root2        14     78   522112+   82  Linux swap
> /dev/vg0/vm-root3        79     783  5662912+  83  Linux
> 
> Maybe this is much more a LVM issue, but which way is the better one for
> use with Xen?
> If I use partitions in a logical volume can they be mounted in the Dom0
> system as well? (e.g. for changing files while DomU is not running)
> Are there any considerations for these two aproaches when using
> live-migration?
> 
> Thanks,
> Reinhard
> 
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users



_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users