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[Xen-devel] xl block-attach vs block-detach

  • To: "xen-devel" <xen-devel@xxxxxxxxxxxxx>
  • From: "Jan Beulich" <JBeulich@xxxxxxxx>
  • Date: Thu, 01 Mar 2012 16:33:07 +0000
  • Delivery-date: Thu, 01 Mar 2012 16:33:04 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xen.org>

So it seems that "xl block-attach" allows a variety of ways to specify the
devices ID (xvdN, dNpN, decimal or hex number) - why is it that the
inverse operation ("xl block-detach") can't deal with anything by a decimal

Further, why is it that with no blktap module loaded I'm getting an
incomplete attach when using the (deprecated) file:/ format for
specifying the backing file? It reports that it would be using qdisk,
and blkfront also sees the device appearing, but all I'm seeing in the
kernel log is the single message from blkfront's probe function. (With
no blktap in pv-ops, I wonder how file backed disks work there.)
When trying to detach such a broken device I'm getting
"unrecognized disk backend type: 0", and the remove fails.


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