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[Xen-bugs] [Bug 356] New: no writing backend for some devices

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Subject: [Xen-bugs] [Bug 356] New: no writing backend for some devices
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Date: Thu, 20 Oct 2005 13:12:06 +0000
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           Summary: no writing backend for some devices
           Product: Xen
           Version: unstable
          Platform: x86-64
        OS/Version: Linux-2.6
            Status: NEW
          Severity: critical
          Priority: P1
         Component: Unspecified
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: boeni@xxxxxx

Some device nodes (/dev/hd*) are missing in a domU. I can find 
in /var/log/messages an interesting thing. For all 16 configured devices i've 
found an entry like:
"...xen1 logger: /etc/xen/scripts/block: bind ..."
But only for 9 devices i've found an entry like:
"...xen1 logger: /etc/xen/scripts/block: Writing backend/vbd/1/..."
On the second try to start the domU i've found 12 "Writing backend" entries and 
on the third try 10 of them. If the root device (/dev/hda1) is one of them, i 
cannot logon to my domU (of course). The missing /dev/hd*'s are these ones, 
which haven't a "Writing backend" entry in the /var/log/messages file.
Interesting thing: I had never this problem with file devices, only with lvm 

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