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[Xen-bugs] [Bug 979] New: Xen fails to transfer eth0 to peth0 on an nfsr

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Subject: [Xen-bugs] [Bug 979] New: Xen fails to transfer eth0 to peth0 on an nfsroot system
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Date: Fri, 11 May 2007 00:11:08 -0700
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           Summary: Xen fails to transfer eth0 to peth0 on an nfsroot system
           Product: Xen
           Version: 3.0.4
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: Tools
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: mb@xxxxxxxxxx

We have a cluster with nodes that mount their root directory over NFS.
Therefore, PERMANENT network access is required. This situation currently is
not well supported by the Xen network scripts.

When we start xend in bridged mode, network connectivity and therefore access
to the root filesystem is lost. Rebooting the node is required.

The cause of the problem probably is that peth0 cannot not created. I presume,
that the Xen scripts cannot rename eth0 to peth0 because it is in use by the
kernel to keep the root filesystem NFS mounted. 

This situation should be detected by the bridge script and handled accordingly,
i.e. not expecting peth0 to exist but continuing to set up the bridge with eth0
instead of peth0.

Our workaround is to disable the network-bridge script and use a modified
script. This script transfers the addresses and routes from eth0 to xenbr0
while keeping the network online all the time.

Occurs on 3.0.2 and 3.0.4 (x86).

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