[Xen-users] backend device not found

[Anand <xen.mails@xxxxxxxxx>]

I was running domains without any problems until now it started to give this error : backend device not found.

Here is the xend.log

[2006-01-06 14:11:40 xend.XendDomainInfo] DEBUG (XendDomainInfo:1271) XendDomainInfo.destroy
: domid=6
[2006-01-06 14:11:40 xend.XendDomainInfo] DEBUG (XendDomainInfo:1279) XendDomainInfo.destroyDomain(6)
[2006-01-06 14:11:45 xend.XendDomainInfo] DEBUG (XendDomainInfo:177) XendDomainInfo.create(['vm', ['name', 'vm01'], ['memory', '32'], ['image', ['linux', ['kernel', '/boot/vmlinuz-
2.6-xen'], ['root', '/dev/sda1 ro'], ['args', 'selinux=0'], ['vcpus', '1'], ['vcpus', '1'], ['boot', 'c'], ['nics', '1']]], ['device', ['vbd', ['uname', 'file:/root/xen/centos.4-2.img'], ['dev', 'sda1'], ['mode', 'w']]], ['device', ['vbd', ['uname', 'file:/root/xen/centos.swap'], ['dev', 'sda2'], ['mode', 'w']]], ['device', ['vif', ['mac', 'AA:00:00:18:98:FB'], ['vifname', '
vii1.0'], ['bridge', 'xenbr0i']]]])
[2006-01-06 14:11:45 xend.XendDomainInfo] DEBUG (XendDomainInfo:282) parseConfig: config is ['vm', ['name', 'vm01'], ['memory', '32'], ['image', ['linux', ['kernel', '/boot/vmlinuz-2.6-xen
'], ['root', '/dev/sda1 ro'], ['args', 'selinux=0'], ['vcpus', '1'], ['vcpus', '1'], ['boot', 'c'], ['nics', '1']]], ['device', ['vbd', ['uname', 'file:/root/xen/centos.4-2.img'], ['dev', 'sda1'], ['mode', 'w']]], ['device', ['vbd', ['uname', 'file:/root/xen/centos.swap'], ['dev', 'sda2'], ['mode', 'w']]], ['device', ['vif', ['mac', 'AA:00:00:18:98:FB'], ['vifname', '
vii1.0'], ['bridge', 'xenbr0i']]]]
[2006-01-06 14:11:45 xend.XendDomainInfo] DEBUG (XendDomainInfo:374) parseConfig: result is {'ssidref': None, 'uuid': None, 'on_crash': None, 'on_reboot': None, 'image': ['linux', ['kernel', '/boot/vmlinuz-
2.6-xen'], ['root', '/dev/sda1 ro'], ['args', 'selinux=0'], ['vcpus', '1'], ['vcpus', '1'], ['boot', 'c'], ['nics', '1']], 'on_poweroff': None, 'cpus': None, 'name': 'vm01', 'backend': [], 'vcpus': 1, 'cpu_weight': None, 'vcpu_avail': None, 'memory': 32, 'device': [('vbd', ['vbd', ['uname', 'file:/root/xen/centos.4-
2.img'], ['dev', 'sda1'], ['mode', 'w']]), ('vbd', ['vbd', ['uname', 'file:/root/xen/centos.swap'], ['dev', 'sda2'], ['mode', 'w']]), ('vif', ['vif', ['mac', 'AA:00:00:18:98:FB'], ['vifname', 'vii1.0'], ['bridge', 'xenbr0i']])], 'bootloader': None, 'cpu': None, 'maxmem': None}
[2006-01-06 14:11:45 xend.XendDomainInfo] DEBUG (XendDomainInfo:1129) XendDomainInfo.construct: None 0
[2006-01-06 14:11:45 xend.XendDomainInfo] DEBUG (XendDomainInfo:1161) XendDomainInfo.initDomain: 7 1.0
[2006-01-06 14:11:45 xend] DEBUG (balloon:84) Balloon: free 746; need 33; done.
[2006-01-06 14:11:45 xend] INFO (image:132) buildDomain os=linux dom=7 vcpus=1
[2006-01-06 14:11:45 xend] DEBUG (image:170) dom            = 7
[2006-01-06 14:11:45 xend] DEBUG (image:171) image          = /boot/vmlinuz-
2.6-xen
[2006-01-06 14:11:45 xend] DEBUG (image:172) store_evtchn   = 1
[2006-01-06 14:11:45 xend] DEBUG (image:173) console_evtchn = 2
[2006-01-06 14:11:45 xend] DEBUG (image:174) cmdline        =  root=/dev/sda1 ro selinux=0
[2006-01-06 14:11:45 xend] DEBUG (image:175) ramdisk        =
[2006-01-06 14:11:45 xend] DEBUG (image:176) vcpus          = 1
[2006-01-06 14:11:45 xend] DEBUG (blkif:24) exception looking up device number for sda1: [Errno 2] No such file or directory: '/dev/sda1'
[2006-01-06 14:11:45 xend] DEBUG (DevController:104) DevController: writing {'virtual-device': '2049', 'backend-id': '0', 'state': '1', 'backend': '/local/domain/0/backend/vbd/7/2049'} to /local/domain/7/device/vbd/2049.
[2006-01-06 14:11:45 xend] DEBUG (DevController:106) DevController: writing {'domain': 'vm01', 'frontend': '/local/domain/7/device/vbd/2049', 'dev': 'sda1', 'state': '1', 'params': '/root/xen/centos.4-2.img', 'mode': 'w', 'frontend-id': '7', 'type': 'file'} to /local/domain/0/backend/vbd/7/2049.
[2006-01-06 14:11:45 xend] DEBUG (blkif:24) exception looking up device number for sda2: [Errno 2] No such file or directory: '/dev/sda2'
[2006-01-06 14:11:45 xend] DEBUG (DevController:104) DevController: writing {'virtual-device': '2050', 'backend-id': '0', 'state': '1', 'backend': '/local/domain/0/backend/vbd/7/2050'} to /local/domain/7/device/vbd/2050.
[2006-01-06 14:11:45 xend] DEBUG (DevController:106) DevController: writing {'domain': 'vm01', 'frontend': '/local/domain/7/device/vbd/2050', 'dev': 'sda2', 'state': '1', 'params': '/root/xen/centos.swap', 'mode': 'w', 'frontend-id': '7', 'type': 'file'} to /local/domain/0/backend/vbd/7/2050.
[2006-01-06 14:11:45 xend] DEBUG (DevController:104) DevController: writing {'backend-id': '0', 'mac': 'AA:00:00:18:98:FB', 'handle': '0', 'state': '1', 'backend': '/local/domain/0/backend/vif/7/0'} to /local/domain/7/device/vif/0.
[2006-01-06 14:11:45 xend] DEBUG (DevController:106) DevController: writing {'bridge': 'xenbr0i', 'domain': 'vm01', 'handle': '0', 'script': '/etc/xen/scripts/vif-bridge', 'state': '1', 'frontend': '/local/domain/7/device/vif/0', 'mac': 'AA:00:00:18:98:FB', 'vifname': '
vii1.0', 'frontend-id': '7'} to /local/domain/0/backend/vif/7/0.
[2006-01-06 14:11:45 xend.XendDomainInfo] DEBUG (XendDomainInfo:661) Storing VM details: {'ssidref': '0', 'uuid': '443a728d-2bd187e8-4b7b42bb-1c0af917', 'on_reboot': 'restart', 'start_time': '
1136536905.74', 'on_poweroff': 'destroy', 'name': 'vm01', 'vcpus': '1', 'vcpu_avail': '1', 'memory': '32', 'on_crash': 'restart', 'image': "(linux (kernel /boot/vmlinuz-2.6-xen) (root '/dev/sda1 ro') (args 'selinux=0') (vcpus 1) (vcpus 1) (boot c) (nics 1))", 'maxmem': '32'}
[2006-01-06 14:11:45 xend.XendDomainInfo] DEBUG (XendDomainInfo:686) Storing domain details: {'console/ring-ref': '57717', 'console/port': '2', 'name': 'vm01', 'console/limit': '1048576', 'vm': '/vm/443a728d-2bd187e8-4b7b42bb-1c0af917', 'domid': '7', 'cpu/0/availability': 'online', 'memory/target': '32768', 'store/ring-ref': '57718', 'store/port': '1'}
[2006-01-06 14:11:45 xend] DEBUG (DevController:133) Waiting for devices vif.
[2006-01-06 14:11:45 xend] DEBUG (DevController:139) Waiting for 0.
[2006-01-06 14:11:45 xend] DEBUG (DevController:409) hotplugStatusCallback /local/domain/0/backend/vif/7/0/hotplug-status.
[2006-01-06 14:11:46 xend] DEBUG (DevController:409) hotplugStatusCallback /local/domain/0/backend/vif/7/0/hotplug-status.
[2006-01-06 14:11:46 xend] DEBUG (DevController:426) hotplugStatusCallback 3.
[2006-01-06 14:11:46 xend] ERROR (SrvBase:87) Request wait_for_devices failed.
Traceback (most recent call last):
  File "/var/tmp/xen-3.0.0-7.1_rhel4.1-root/usr/lib/python/xen/web/SrvBase.py", line 85, in perform
  File "/var/tmp/xen-3.0.0-7.1_rhel4.1-root/usr/lib/python/xen/xend/server/SrvDomain.py
", line 72, in op_wait_for_devices
  File "/var/tmp/xen-3.0.0-7.1_rhel4.1-root/usr/lib/python/xen/xend/XendDomainInfo.py", line 1349, in waitForDevices
  File "/var/tmp/xen-3.0.0-7.1_rhel4.1-root/usr/lib/python/xen/xend/XendDomainInfo.py
", line 977, in waitForDevices_
  File "/var/tmp/xen-3.0.0-7.1_rhel4.1-root/usr/lib/python/xen/xend/server/DevController.py", line 135, in waitForDevices
  File "/var/tmp/xen-3.0.0-7.1_rhel4.1-root/usr/lib/python/xen/xend/server/DevController.py
", line 151, in waitForDevice
VmError: Device 0 (vif) could not be connected. Backend device not found.


My vm01 config is as follows:

kernel = "/boot/vmlinuz-2.6-xen"
memory = 32
name = "vm01"
nics = 1
dhcp ="off"
vif = ['mac=AA:00:00:18:98:FB, bridge=xenbr0i, vifname=vii1.0']
extra="selinux=0"
disk = ['file:/root/xen/centos.4-2.img,sda1,w', 'file:/root/xen/centos.swap,sda2,w']
root = "/dev/sda1 ro"


-- 

regards,

Anand
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