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Re: [Xen-users] migrate a VM to another machine (XEN on SLES10SP1)

Subject: Re: [Xen-users] migrate a VM to another machine (XEN on SLES10SP1)
From: Andre Konopka <andre.konopka@xxxxxxxxxxxxxx>
Date: Thu, 09 Aug 2007 15:11:27 +0200
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Thank you for your hint,
the problem was my "cd". On the second machine the path didn't exist.


Thanks

Andre


trilok nuwal wrote:
What i think is disk0 is yr domU image on SAN.
/virtmach/images/sles10ak/disk0

Did u mount yr SAN disk partition at common mount point at both the machies.

mount /dev/sdc to common mount point like /virtmach on both machine.

Beacuse from the log, it looks like on destination machine u r not able to access the disk0.

Simple thing is just copy the domU onfig file to other machine and try to craete the domU. If it goes fine then u could try migration.

--Triok
On 8/9/07, *Andre Konopka* <andre.konopka@xxxxxxxxxxxxxx <mailto:andre.konopka@xxxxxxxxxxxxxx>> wrote:


    Hi

    I'm trying to build a HA Xen Cluster on SLES10SP1

    I have two machines running a XEN dom0, the two machines share a SAN
    disk, installed as OCFS2 partition.

    First I installed SLES10 as a guest machine. The image is stored on my
    shared partion.
    I can start and stop the VM on the machine where I created it without
    any problem...

    Okay, as next step I changed the xend-config.sxp config file and enabled
    relocation.

    First I tried an offline migration. Without success...

    In the log I found the following information (on the target machine).
    Maybe someone can explain it a little bit:

    [2007-08-08 14:31:58 xend 4730] ERROR (XendDomain:1011) Restore failed
    Traceback (most recent call last):
       File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomain.py",
    line 1006, in domain_restore_fd
         return XendCheckpoint.restore(self, fd, paused=paused)
       File
    "/usr/lib64/python2.4/site-packages/xen/xend/XendCheckpoint.py",
    line 173, in restore
         dominfo.waitForDevices() # Wait for backends to set up
       File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py",
    line 503, in waitForDevices
         self.getDeviceController (devclass).waitForDevices()
       File
    "/usr/lib64/python2.4/site-packages/xen/xend/server/DevController.py",
    line 149, in waitForDevices
         return map(self.waitForDevice, self.deviceIDs())
       File
    "/usr/lib64/python2.4/site-packages/xen/xend/server/DevController.py",
    line 168, in waitForDevice
         raise VmError("Device %s (%s) could not be connected. "
    VmError: Device 51728 (vbd) could not be connected. Backend device not
    found.

    For me it seems that the second machine can't activate the disc???

    On the first machine my shared partion is mounted as /dev/sdc

      Device File: /dev/sdc (/dev/sg3)
       Device Files: /dev/sdc,
    /dev/disk/by-id/scsi-3600508b4001077d100008000ecdf0000,
    /dev/disk/by-path/pci-0000:10:00.0-scsi-0:0:0:3,
    /dev/disk/by-uuid/7646af4f-e57e-4f1c-974b-308d552ff4a5,
    /dev/disk/by-label/virtmach

    on the second machine as /dev/sdb

    Device File: /dev/sdb (/dev/sg2)
      Device Files: /dev/sdb,
    /dev/disk/by-id/scsi-3600508b4001077d100008000ecdf0000,
    /dev/disk/by-path/pci-0000:10:00.0-scsi-0:0:0:2,
    /dev/disk/by-uuid/7646af4f-e57e-4f1c-974b-308d552ff4a5,
    /dev/disk/by-label/virtmach


    This is the config file, created by the graphical 'virt-manager'.

    ostype="sles10"
    name="sles10-1"
    memory=512
    vcpus=1
    uuid="55adf3ee-9f23-f3d4-6cad-48d4c43cdf84"
    on_crash="destroy"
    on_poweroff="destroy"
    on_reboot="restart"
    localtime=0
    builder="linux"
    bootloader="/usr/lib/xen/boot/domUloader.py"
    bootargs="--entry=xvda2:/boot/vmlinuz-xen,/boot/initrd-xen"
    extra="TERM=xterm "
    disk=[ 'file:/virtmach/images/sles10ak/disk0,xvda,w',
    'file:/isoimages/SLES-10-SP1-x86_64-DVD1.iso,xvdb,r', ]
    vif=[ 'mac=00:16:3e:6f:70:d0', ]
    vfb=["type=vnc,vncunused=1"]



    After booting both dom0 machines my fresh installed domU isn't visible
    any longer.
    The image ist still on my shared partition but 'xm list' only reports
    the dom0 instance????

    HOW can I 'import' my 'lost' domU???

    I think this 'import' is also necessary for my HA solution. If my first
    machine crashes, the second one must be able to 'import' the DOMU to
    start it???


    Best regards

    Andre




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