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[Xen-bugs] [Bug 1438] New: Cannot use pygrub with drbd blcok device as x

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Subject: [Xen-bugs] [Bug 1438] New: Cannot use pygrub with drbd blcok device as xvda.
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Date: Wed, 25 Mar 2009 13:55:26 -0700
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           Summary: Cannot use pygrub with drbd blcok device as xvda.
           Product: Xen
           Version: 3.0.4
          Platform: All
               URL: http://ben.timby.com/?p=80
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Tools
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: btimby@xxxxxxxxx

I ran into this problem when I installed CentOS into a Xen domU using the


After installation, you are urged to use bootloader=â??/usr/bin/pygrubâ??

However, trying to start the domU results in the error â??Error: Disk
isnâ??t accessibleâ??. A google search turns up speculation that this is
somehow pygrubâ??s fault, however, if one runs pygrub /dev/drbd0, it
works as expected.

The problem is in the xm utility, it attempts to resolve the disk name
(drbd0) into a device name (/dev/drbd0) by using the disk type (drbd).
However, it does not recognize the type drbd, so it fails to do so.
Attached is a patch that simply treats a drbd disk like phy and
returns â??/dev/%sâ?? % â??drbd0â?³.

I realize that a resource (drbd0) may actually use a different device
node than /dev/drbd0, however, resolving this would require parsing
the drbd.conf file and also using the current host name to locate the
correct â??onâ?? section. I figure this patch is good enough to work for
most folks.

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