RE: 3.0.3rc2 BUG: LVM backed qcow image not working?

RE: 3.0.3rc2 BUG: LVM backed qcow image not working?

[Timo Benk]

Hi,

Sorry, small typo ...

i try to create a LVM backed qcow image, but it seems qcow does not
like LVM.

=== create qcow image LV ===
# lvcreate --name xendom_qcow --size 100G xenvol
# mkreiserfs /dev/xenvol/xendom_qcow
# mount /dev/xenvol/xendom_qcow /var/lib/xen/images

=== create base LV and fill with data ===
# lvcreate --name xendom_base_qcow --size 10G xenvol
# mkreiserfs /dev/xenvol/xendom_base_qcow
# mount /dev/xenvol/xendom_base_qcow /mnt
# tar cpjf domu-base.tar.bz2 -C /mnt

=== create file backed qcow image ===
# qcow-create 5120 /var/lib/xen/images/xengate_root.qcow
  /dev/xenvol/xendom_base_qcow
# xm block-attach Domain-0
     tap:qcow:/var/lib/xen/images/xengate_root.qcow xvda1 w 0
# mount /dev/xvda1 /mnt
[... mount is hanging forever ...]

# dmesg
[...]
ReiserFS: xvda1: checking transaction log (xvda1)
blk_tap: Can't get UE info

???

Greetings,
-timo

-- 
Timo Benk - Jabber ID: fry@jabber.org - ICQ ID: #241877854
PGP Public Key: http://m28s01.vlinux.de/timo_benk_gpg_key.asc

Re: RE: 3.0.3rc2 BUG: LVM backed qcow image not working?

[Timo Benk]

Next try,

using a logical partition ...

=== prepare image partition ===
# mkreiserfs /dev/hdc5
# mount /dev/hdc5 /var/lib/xen/images

=== prepare base partition ===
# mkreiserfs /dev/hdc6
# mount /dev/hdc6 /mnt
# tar cpjf domu-base.tar.bz2 -C /mnt

=== create file backed qcow image ===
# qcow-create 5120 /var/lib/xen/images/xengate_root.qcow
    /dev/hdc6
# xm block-attach Domain-0
    tap:qcow:/var/lib/xen/images/xengate_root.qcow xvda1 w 0
# mount /dev/xvda1 /mnt
[... changing some files ...]

# umount /mnt
[... umount is hanging forever ...]

# dmesg
[... nothing interesting ...]

Do i anything wrong here? Or maybe a broblem with reiserfs?

BTW, how stable is qcow considered at the moment? Reading the README
it seams quite mature to me.

Greetings,
-timo

Timo Benk wrote:
> Hi,
> 
> Sorry, small typo ...
> 
> i try to create a LVM backed qcow image, but it seems qcow does not
> like LVM.
> 
> === create qcow image LV ===
> # lvcreate --name xendom_qcow --size 100G xenvol
> # mkreiserfs /dev/xenvol/xendom_qcow
> # mount /dev/xenvol/xendom_qcow /var/lib/xen/images
> 
> === create base LV and fill with data ===
> # lvcreate --name xendom_base_qcow --size 10G xenvol
> # mkreiserfs /dev/xenvol/xendom_base_qcow
> # mount /dev/xenvol/xendom_base_qcow /mnt
> # tar cpjf domu-base.tar.bz2 -C /mnt
> 
> === create file backed qcow image ===
> # qcow-create 5120 /var/lib/xen/images/xengate_root.qcow
>   /dev/xenvol/xendom_base_qcow
> # xm block-attach Domain-0
>      tap:qcow:/var/lib/xen/images/xengate_root.qcow xvda1 w 0
> # mount /dev/xvda1 /mnt
> [... mount is hanging forever ...]
> 
> # dmesg
> [...]
> ReiserFS: xvda1: checking transaction log (xvda1)
> blk_tap: Can't get UE info
> 
> ???
> 
> Greetings,
> -timo
> 


-- 
Timo Benk - Jabber ID: fry@jabber.org - ICQ ID: #241877854
PGP Public Key: http://m28s01.vlinux.de/timo_benk_gpg_key.asc

Re: RE: 3.0.3rc2 BUG: LVM backed qcow image not working?

[Timo Benk]

Thats also interesting ...

xendom0:~ # ps -ef  | grep mount
Segmentation fault

Timo Benk wrote:
> Next try,
> 
> using a logical partition ...
> 
> === prepare image partition ===
> # mkreiserfs /dev/hdc5
> # mount /dev/hdc5 /var/lib/xen/images
> 
> === prepare base partition ===
> # mkreiserfs /dev/hdc6
> # mount /dev/hdc6 /mnt
> # tar cpjf domu-base.tar.bz2 -C /mnt
> 
> === create file backed qcow image ===
> # qcow-create 5120 /var/lib/xen/images/xengate_root.qcow
>     /dev/hdc6
> # xm block-attach Domain-0
>     tap:qcow:/var/lib/xen/images/xengate_root.qcow xvda1 w 0
> # mount /dev/xvda1 /mnt
> [... changing some files ...]
> 
> # umount /mnt
> [... umount is hanging forever ...]
> 
> # dmesg
> [... nothing interesting ...]
> 
> Do i anything wrong here? Or maybe a broblem with reiserfs?
> 
> BTW, how stable is qcow considered at the moment? Reading the README
> it seams quite mature to me.
> 
> Greetings,
> -timo
> 
> Timo Benk wrote:
>> Hi,
>>
>> Sorry, small typo ...
>>
>> i try to create a LVM backed qcow image, but it seems qcow does not
>> like LVM.
>>
>> === create qcow image LV ===
>> # lvcreate --name xendom_qcow --size 100G xenvol
>> # mkreiserfs /dev/xenvol/xendom_qcow
>> # mount /dev/xenvol/xendom_qcow /var/lib/xen/images
>>
>> === create base LV and fill with data ===
>> # lvcreate --name xendom_base_qcow --size 10G xenvol
>> # mkreiserfs /dev/xenvol/xendom_base_qcow
>> # mount /dev/xenvol/xendom_base_qcow /mnt
>> # tar cpjf domu-base.tar.bz2 -C /mnt
>>
>> === create file backed qcow image ===
>> # qcow-create 5120 /var/lib/xen/images/xengate_root.qcow
>>   /dev/xenvol/xendom_base_qcow
>> # xm block-attach Domain-0
>>      tap:qcow:/var/lib/xen/images/xengate_root.qcow xvda1 w 0
>> # mount /dev/xvda1 /mnt
>> [... mount is hanging forever ...]
>>
>> # dmesg
>> [...]
>> ReiserFS: xvda1: checking transaction log (xvda1)
>> blk_tap: Can't get UE info
>>
>> ???
>>
>> Greetings,
>> -timo
>>
> 
> 


-- 
Timo Benk - Jabber ID: fry@jabber.org - ICQ ID: #241877854
PGP Public Key: http://m28s01.vlinux.de/timo_benk_gpg_key.asc