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

To: xen-users <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] Guest O/S Questions
From: "Karsten M. Self" <karsten@xxxxxxxxxxxxx>
Date: 2005年8月29日 15:37:11 -0700
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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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