Re: [Xen-users] Xen with LVM

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

> Thanks Mark, I'm going to try that, but does lomount also work with LVM
> or just if I would use a image file?

I think it ought to work with anything.

> ..I figured that LV's are the safer choice for a productive environment
> then image files, because tests showed me
> that the image file puts a lot more load on dom0 then the LV's do.

Agreed.

Cheers,
Mark

> Thanks,
> Robin
>
> Mark Williamson wrote:
> > The lomount tool - originally from qemu but also distributed with Xen -
> > makes it more straightforward to mount partitions within an image file. 
> > It handles calculation of offsets etc for you.  This is what I generally
> > use to access partitions within a virtual disk.
> >
> > The other tool folks sometimes use is "kpartx", which I believe supports
> > partitions using device mapper.
> >
> > In either case the end result is much the same: a friendlier way of
> > accessing partitions within an image.
> >
> > Don't worry about sfdisk grumbling at you, ISTR that's normal.
> >
> > Hope this helps,
> >
> > Cheers,
> > mark
> >
> > On Friday 12 October 2007, 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
> >>
> >>> 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.
> >>
> >> -Errol
> >>
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> >>
> >>
> >>
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-- 
Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!

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