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Old 03-06-2011, 12:18 PM
Sthu Deus
 
Default KVM image

Good time of the day.


I can not mount a KVM HDD file - in the VM I create partition on the VM
device, format it, latter I can access it in KVM.

But when I try to mount the file in host environment (not VM) it
requires FS type, when it is specified, it gives usual error - bad SB,
mount option, etc.

That's how I do it (and months ago it did work perfectly):

# mount -t ext3 -o loop,offset=32256 ./db /mnt/0

# ls
da db

the versions of KVM and related software is Debian 6 up to the date.


Thanks for Your time.

PS Please, reply to the list.


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Old 03-06-2011, 02:46 PM
Daniel Bareiro
 
Default KVM image

On Sunday, 06 March 2011 20:18:10 +0700,
Sthu Deus wrote:

> Good time of the day.

Hi, Sthu.

> I can not mount a KVM HDD file - in the VM I create partition on the
> VM device, format it, latter I can access it in KVM.
>
> But when I try to mount the file in host environment (not VM) it
> requires FS type, when it is specified, it gives usual error - bad SB,
> mount option, etc.
>
> That's how I do it (and months ago it did work perfectly):
>
> # mount -t ext3 -o loop,offset=32256 ./db /mnt/0
>
> # ls
> da db
>
> the versions of KVM and related software is Debian 6 up to the date.

With raw devices I have not had problems with Debian 6.0:


ss01:~# fdisk -l /dev/vms/debian-test4

Disco /dev/vms/debian-test4: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cilindros of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 65536 bytes / 131072 bytes
Disk identifier: 0x000b7998

Disposit. Inicio Comienzo Fin Bloques Id Sistema
/dev/vms/debian-test4p1 1 122 979933+ 82 Linux swap / Solaris
Partition 1 does not start on physical sector boundary.
/dev/vms/debian-test4p2 123 1305 9502447+ 83 Linux
Partition 2 does not start on physical sector boundary.


ss01:~# losetup /dev/loop
loop0 loop1 loop2 loop3 loop4 loop5 loop6 loop7
ss01:~# losetup /dev/loop0 /dev/vms/debian-test4


ss01:~# losetup -a
/dev/loop0: [0005]:5012 (/dev/mapper/vms-debian--test4)


ss01:~# fdisk -l /dev/loop0

Disco /dev/loop0: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cilindros of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000b7998

Disposit. Inicio Comienzo Fin Bloques Id Sistema
/dev/loop0p1 1 122 979933+ 82 Linux swap / Solaris
/dev/loop0p2 123 1305 9502447+ 83 Linux


ss01:~# parted /dev/loop0
GNU Parted 2.3
Using /dev/loop0
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) unit
Unit? [compact]? B
(parted) print
Model: (file)
Disk /dev/loop0: 10737418240B
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number Start End Size Type File system Flags
1 32256B 1003484159B 1003451904B primary linux-swap(v1)
2 1003484160B 10733990399B 9730506240B primary ext3

(parted)


ss01:~# mount -o offset=1003484160 /dev/loop0 /mnt/


ss01:~# mount | grep loop
/dev/loop1 on /mnt type ext3 (rw,offset=1003484160)


ss01:~# df -h | grep loop
/dev/loop1 9,0G 927M 7,6G 11% /mnt


ss01:~# cd /mnt/
ss01:/mnt# ll
total 100
drwxr-xr-x 2 root root 4096 ene 15 10:11 bin
drwxr-xr-x 3 root root 4096 ene 15 10:12 boot
lrwxrwxrwx 1 root root 11 ago 14 2010 cdrom -> media/cdrom
drwxr-xr-x 4 root root 4096 ago 14 2010 dev
drwxr-xr-x 3 root root 4096 ago 14 2010 emul
drwxr-xr-x 58 root root 4096 ene 16 11:25 etc
drwxr-xr-x 3 root root 4096 ago 14 2010 home
lrwxrwxrwx 1 root root 30 ago 14 2010 initrd.img -> boot/initrd.img-2.6.26-2-amd64
lrwxrwxrwx 1 root root 30 ago 14 2010 initrd.img.old -> boot/initrd.img-2.6.26-1-amd64
drwxr-xr-x 11 root root 12288 ene 15 10:10 lib
lrwxrwxrwx 1 root root 20 ago 14 2010 lib32 -> /emul/ia32-linux/lib
lrwxrwxrwx 1 root root 4 ago 14 2010 lib64 -> /lib
drwx------ 2 root root 16384 ago 14 2010 lost+found
drwxr-xr-x 3 root root 4096 ago 14 2010 media
drwxr-xr-x 2 root root 4096 dic 4 2008 mnt
drwxr-xr-x 2 root root 4096 ago 14 2010 opt
drwxr-xr-x 2 root root 4096 dic 4 2008 proc
drwxr-xr-x 5 root root 4096 ene 15 11:14 root
drwxr-xr-x 2 root root 4096 ene 15 10:22 sbin
drwxr-xr-x 2 root root 4096 sep 16 2008 selinux
drwxr-xr-x 2 root root 4096 ago 14 2010 srv
drwxr-xr-x 2 root root 4096 ago 12 2008 sys
drwxrwxrwt 4 root root 4096 ene 16 11:08 tmp
drwxr-xr-x 11 root root 4096 ago 15 2010 usr
drwxr-xr-x 14 root root 4096 ene 15 11:37 var
lrwxrwxrwx 1 root root 27 ago 14 2010 vmlinuz -> boot/vmlinuz-2.6.26-2-amd64
lrwxrwxrwx 1 root root 27 ago 14 2010 vmlinuz.old -> boot/vmlinuz-2.6.26-1-amd64





Regards,
Daniel
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