Re: [Xen-users] Guest O/S Questions

["Karsten M. Self" <karsten@xxxxxxxxxxxxx>]

Karsten M. Self wrote:

> 4. Find out the image file's partitioning.  fdisk's '-u' option gives
>    output in sectors.  This helps in the next step.  Sample partition
>    table:
>        $ /sbin/fdisk -lu rhel4
>        You must set cylinders.
>        You can do this from the extra functions menu.
>
>        Disk rhel4: 0 MB, 0 bytes
>        255 heads, 63 sectors/track, 0 cylinders, total 0 sectors
>        Units = sectors of 1 * 512 = 512 bytes
>
>         Device Boot      Start         End      Blocks   Id  System
>        rhel4p1   *          63      208844      104391   83  Linux
>        rhel4p2          208845      401624       96390   82  Linux 
> swap / Solaris
>        rhel4p3          401625     4192964     1895670   83  Linux
>
>    Ignore the cylinder messages (they matter if you're going to modify
>    the partition table).
>
>    The start sector times the blocksize (512 bytes) gives you the
>    partition offset in bytes.  This is used if you want to loopback
>    mount the filesystems to copy them someplace else, which you do.
>
>    The first partition is /boot, the second is /.  I didn't use logical
>    volumes, though it's possible to do so, complicating matters
>    somewhat more.
...or as Ian pointed out off-list, you can use lomount (there's a 
related losetup command), included in Xen 3.  I mentioned the 
hand-rolled method as lomount isn't generally available in most 
off-the-shelf distros.  It also helps in understanding the concept of 
partitioned files.
Cheers.

--
Karsten M. Self <karsten@xxxxxxxxxxxxx>
XenSource, Inc.
2300 Geng Road #250                                +1 650.798.5900 x259
Palo Alto, CA 94303                                +1 650.493.1579 fax


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