Xen users - Oct 2006 - Q: Understanding "xm block-list"

Hi,

how can I see who''s who?:
# xm block-list vm1
Vdev  BE handle state evt-ch ring-ref BE-path
768    0    0     4      11     1036  /local/domain/0/backend/vbd/9/768
832    0    0     3      12     1037  /local/domain/0/backend/vbd/9/832
# xm block-list vm3
Vdev  BE handle state evt-ch ring-ref BE-path
768    0    0     4      11     1036  /local/domain/0/backend/vbd/10/768
832    0    0     3      12     1037  /local/domain/0/backend/vbd/10/832

If I want to detach the CD-ROM drive to enable media change, what''s the
correct
device?

Did someone forget a translation for "768"? 768 is 0x300, and /dev/hda
has major
3, minor 0. Considering that "xm" is a python program,
shouldn''t it translate the
numbers to something more useful? Likewise why not allow device names for
"block-
detach" as well?

Regards,
Ulrich


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> Did someone forget a translation for "768"? 768 is 0x300, and
/dev/hda has
> major 3, minor 0. Considering that "xm" is a python program,
shouldn''t it
> translate the numbers to something more useful? Likewise why not allow
> device names for "block- detach" as well?
True, but this would only work for Linux guests, because other OSes will have 
a different idea of what a vdev number means to them.  Doing this decoding 
would need the tools to be aware of the kind of guest OS running to provide 
sensible naming (or fall back to numbers) - doable, though.

An easier route might be to simply allow disks to be named by the user in the 
config file.  It''d be a relatively simple patch, adding an extra
component to
the disk description.

You could file it as a wishlist in the bug tracker.

HTH,
Cheers,
Mark

-- 
Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!

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