On Dec 19, 2007 8:51 PM, Michael D. Kralka michael.kralka@kvs.com wrote:
Alain Spineux wrote:
On Dec 19, 2007 7:26 PM, Matthew Lind mlind@nhctc.edu wrote:
Hello Mailing List!
A quick question. Has anyone gotten a resize (in my case grown) a Xen DomU disk image?
Here is the procedure I have followed:
- Install a DomU using virt-install Customize xvda to be all one partition ext3
- On Dom0: dd if=/dev/zero bs=1G count=1 >> <my_disk_image> ll -h (Image is now 1GB larger) xm create <DomU> On DomU: df -h (Size has not changed) shutdown -h now On Dom0:
e2fsck works only on device, but yuo can creat a loop device using losetup
someting like
losetup -f <my_disk_image>
now you can mount, e2fsck or resize /dev/loop0
It appears as though the disk image was partitioned within the domU (the
Then some sample, still using losetup :-)
[root@dell360 ~]# losetup -f /data/fc6-eg-disk0.img [root@dell360 ~]# kpartx -l /dev/loop0 loop0p1 : 0 208782 /dev/loop0 63 loop0p2 : 0 16032870 /dev/loop0 208845 loop0p3 : 0 530145 /dev/loop0 16241715 [root@dell360 ~]# kpartx -av /dev/loop0 add map loop0p1 : 0 208782 linear /dev/loop0 63 add map loop0p2 : 0 16032870 linear /dev/loop0 208845 add map loop0p3 : 0 530145 linear /dev/loop0 16241715 [root@dell360 ~]# e2fsck -f /dev/mapper/loop0p1 e2fsck 1.39 (29-May-2006) Pass 1: Checking inodes, blocks, and sizes Pass 2: Checking directory structure Pass 3: Checking directory connectivity Pass 4: Checking reference counts Pass 5: Checking group summary information /boot: 47/26104 files (17.0% non-contiguous), 24433/104388 blocks [root@dell360 ~]# kpartx -d /dev/loop0 [root@dell360 ~]# losetup -d /dev/loop0
OP is speaking of xvda and not xvda1), so I don't think that is going to work either. I think you need to use "xm block-attach". Something like:
modprobe xenblk xm block-attach 0 'file:/path/to/image/file' xvda wThis will create two new device files /dev/xvda (the hole disk) and /dev/xvda1 (the only partition on this disk).
You can now use any partition editor you want to expand the first partition on /dev/xvda.
For example: (s)fdisk to expand the partition, "e2fsck -f /dev/xvda1" to check for errors (required to run resize2fs), then "resize2fs /dev/xvda1" to resize to fill the expanded partition.
When you are done, use "xm block-detach" to release the virtual disk.
The xm man page is very helpful for accessing domU disk images on dom0.
Cheers, Michael
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