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Re: [Xen-users] Xen with LVM

  • To: xen-users@xxxxxxxxxxxxxxxxxxx
  • From: "IDAGroup - R.W.Muller" <robin@xxxxxxxxxxx>
  • Date: Thu, 11 Oct 2007 23:44:36 -0400
  • Delivery-date: Thu, 11 Oct 2007 20:45:44 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>

Hi Errol

Errol Neal wrote:
Quoting "IDAGroup - R.W.Muller" <robin@xxxxxxxxxxx>:

Hello Errol, I tried that and get a little weird partition table:

sfdisk -l -uS /dev/vms/centos5_data

Disk /dev/vms/centos5_data: 0 cylinders, 0 heads, 0 sectors/track
Warning: The partition table looks like it was made
 for C/H/S=*/255/63 (instead of 0/0/0).
For this listing I'll assume that geometry.
Units = sectors of 512 bytes, counting from 0

  Device Boot    Start       End   #sectors  Id  System
/dev/vms/centos5_data1   *        63   3068414    3068352  83  Linux
/dev/vms/centos5_data2             0         -          0   0  Empty
/dev/vms/centos5_data3             0         -          0   0  Empty
/dev/vms/centos5_data4             0         -          0   0  Empty

I wouldn't worry too much about that. sfdisk is probably just confused. Since the file doesn't have a ioctl, that would be my guess
Ok I just ignore this partitions :)

Now I just have to find out, how I can get ride of the Empty partitions
and how to use snapshot for backup and I'm getting closer
to a usable result :)

lvcreate -L1G -n vmsnap /dev/vms/centos5_data

Then mount it as above. Keep in mind that for snapshots, all changes to the live volume are written to the COW table on the snapshot volume. Make sure you allocate enough space for this.
Ok, that means I need at least douple the hardware space then the size of the LV, or I'm wrong with this?
....let's say my LV centos5 is 80GB in size, will I need a 160GB harddrive in this blade server in order to get the snapshot and then mount and rsync it to another harddrive? ...or what do you recomment
for backup purpose?

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