Xen users - Aug 2007 - Re: xm block-attach from dom0 and exception looking up device number for /dev/xvda1 - why ?

I still have the same problem as Ian Brown.

I mounted the image as follow:
# xm block-attach 0
tap:qcow:/var/lib/xend/storage/ba714891-9799-b01c-cc8c-78a7880c4d7d.qcow
/dev/xvda1 w 0

Then I can see it in the block-device-list
# xm block-list 0
Vdev  BE handle state evt-ch ring-ref BE-path
56321    0    0     3      18     8
/local/domain/0/backend/tap/0/56321

And mounting it fails :(
# mount /dev/xvda1 /mnt/test
mount: /dev/xvda1 is not a valid block device

So I tried the the approach with mknod (253 blktap):
# mknod /dev/xvda1 b 253 1
# mount /dev/xvda1 /mnt/test
mount: /dev/xvda1 is not a valid block device

Here the debug output of xen:
[2007-08-10 21:09:30 14463] DEBUG (__init__:1072)
XendDomainInfo.device_create: [''tap'',
[''uname'',
''tap:qcow:/var/lib/xend/storage/ba714891-9799-b01c-cc8c-78a7880c4d7d.qco
w''], [''dev'', ''/dev/xvda1''],
[''mode'', ''w''], [''backend'',
''0'']]
[2007-08-10 21:09:30 14463] DEBUG (__init__:1072)
XendDomainInfo.device_create: {''uuid'':
''c9959c8c-d71a-d788-bab1-b5f0a476ebf2'',
''bootable'': 0, ''dev'':
''/dev/xvda1'', ''uname'':
''tap:qcow:/var/lib/xend/storage/ba714891-9799-b01c-cc8c-78a7880c4d7d.qco
w'', ''mode'': ''w'',
''backend'': ''0''}
[2007-08-10 21:09:30 14463] DEBUG (__init__:1072) DevController: writing
{''backend-id'': ''0'',
''virtual-device'': ''56321'',
''device-type'': ''disk'',
''state'': ''1'', ''backend'':
''/local/domain/0/backend/tap/0/56321''} to
/local/domain/0/device/vbd/56321.
[2007-08-10 21:09:30 14463] DEBUG (__init__:1072) DevController: writing
{''domain'': ''Domain-0'',
''frontend'':
''/local/domain/0/device/vbd/56321'',
''uuid'':
''c9959c8c-d71a-d788-bab1-b5f0a476ebf2'',
''dev'': ''/dev/xvda1'',
''state'': ''1'', ''params'':
''qcow:/var/lib/xend/storage/ba714891-9799-b01c-cc8c-78a7880c4d7d.qcow'',
''mode'': ''w'', ''online'':
''1'', ''frontend-id'': ''0'',
''type'': ''tap''} to
/local/domain/0/backend/tap/0/56321.
[2007-08-10 21:09:30 14463] DEBUG (__init__:1072) Waiting for 56321.
[2007-08-10 21:09:30 13911] DEBUG (__init__:1072) hotplugStatusCallback
/local/domain/0/backend/tap/0/56321/hotplug-status.
[2007-08-10 21:09:30 13911] DEBUG (__init__:1072) hotplugStatusCallback
/local/domain/0/backend/tap/0/56321/hotplug-status.

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xm block-attach and so on is for attaching "new drives" or "extra
drives" to a
already running domU


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