[Xen-users] exception looking up device number for sda1

["Anand Gupta" <xen.mails@xxxxxxxxx>]

I just tried to setup another domain on a server running 1 domain. When i try to start the domain it gives me an error

Error: Device 0 (vif) could not be connected. Backend device not found.

The entry in my xen config file for the disks is 

disk = ['phy:/dev/xen001/xen2-fun,sda1,w','phy:/dev/xen001/xen2-fun-swap,sda2,w']

Looking at /var/log/xend.log, i found something strange

[2006-05-22 00:13:02 xend.XendDomainInfo] DEBUG (XendDomainInfo:178) 
XendDomainInfo.create(['vm', ['name', 'xen3'], ['memory', 128], ['vcpus', 1], ['image', ['linux', ['kernel', '/boot/vmlinuz-2.6.16-xen-xensrv'], ['ramdisk', '/boot/initrd-2.6.16-xen-xensrv.img'], ['ip', 'x.x.x.x:1.2.3.4:y.y.y.y:255.255.255.240::eth0:off'
], ['root', '/dev/sda1 ro'], ['args', 'selinux=0']]], ['device', ['vbd', ['uname', 'phy:/dev/xen001/xen2-fun'], ['dev', 'sda1'], ['mode', 'w']]], ['device', ['vbd', ['uname', 'phy:/dev/xen001/xen2-fun-swap'], ['dev', 'sda2'], ['mode', 'w']]], ['device', ['vif', ['ip', '
x.x.x.x'], ['mac', 'AA:00:00:18:98:FD'], ['vifname', 'vm03']]]])
[2006-05-22 00:13:02 xend.XendDomainInfo] DEBUG (XendDomainInfo:284) parseConfig: config is ['vm', ['name', 'xen3'], ['memory', 128], ['vcpus', 1], ['image', ['linux', ['kernel', '/boot/vmlinuz-
2.6.16-xen-xensrv'], ['ramdisk', '/boot/initrd-2.6.16-xen-xensrv.img'], ['ip', 'x.x.x.x:1.2.3.4:y.y.y.y:255.255.255.240::eth0:off'], ['root', '/dev/sda1 ro'], ['args', 'selinux=0']]], ['device', ['vbd', ['uname', 'phy:/dev/xen001/xen2-fun'], ['dev', 'sda1'], ['mode', 'w']]], ['device', ['vbd', ['uname', 'phy:/dev/xen001/xen2-fun-swap'], ['dev', 'sda2'], ['mode', 'w']]], ['device', ['vif', ['ip', '
x.x.x.x'], ['mac', 'AA:00:00:18:98:FD'], ['vifname', 'vm03']]]]
[2006-05-22 00:13:02 xend.XendDomainInfo] DEBUG (XendDomainInfo:380) parseConfig: result is {'ssidref': None, 'uuid': None, 'on_crash': None, 'on_reboot': None, 'image': ['linux', ['kernel', '/boot/vmlinuz-
2.6.16-xen-xensrv'], ['ramdisk', '/boot/initrd-2.6.16-xen-xensrv.img'], ['ip', 'x.x.x.x:1.2.3.4:y.y.y.y:255.255.255.240::eth0:off'], ['root', '/dev/sda1 ro'], ['args', 'selinux=0']], 'on_poweroff': None, 'cpus': None, 'name': 'xen3', 'backend': [], 'vcpus': 1, 'cpu_weight': None, 'vcpu_avail': None, 'memory': 128, 'device': [('vbd', ['vbd', ['uname', 'phy:/dev/xen001/xen2-fun'], ['dev', 'sda1'], ['mode', 'w']]), ('vbd', ['vbd', ['uname', 'phy:/dev/xen001/xen2-fun-swap'], ['dev', 'sda2'], ['mode', 'w']]), ('vif', ['vif', ['ip', '
x.x.x.x'], ['mac', 'AA:00:00:18:98:FD'], ['vifname', 'vm03']])], 'bootloader': None, 'cpu': None, 'maxmem': None}
[2006-05-22 00:13:02 xend.XendDomainInfo] DEBUG (XendDomainInfo:1164) XendDomainInfo.construct: None 0
[2006-05-22 00:13:02 xend.XendDomainInfo] DEBUG (XendDomainInfo:1196) XendDomainInfo.initDomain: 11 1.0
[2006-05-22 00:13:02 xend] DEBUG (balloon:126) Balloon: free 426; need 129; done.
[2006-05-22 00:13:02 xend] INFO (image:135) buildDomain os=linux dom=11 vcpus=1
[2006-05-22 00:13:02 xend] DEBUG (image:173) dom            = 11
[2006-05-22 00:13:02 xend] DEBUG (image:174) image          = /boot/vmlinuz-2.6.16-xen-xensrv
[2006-05-22 00:13:02 xend] DEBUG (image:175) store_evtchn   = 1
[2006-05-22 00:13:02 xend] DEBUG (image:176) console_evtchn = 2
[2006-05-22 00:13:02 xend] DEBUG (image:177) cmdline        =  ip=x.x.x.x:1.2.3.4:y.y.y.y:255.255.255.240::eth0:off root=/dev/sda1 ro selinux=0
[2006-05-22 00:13:02 xend] DEBUG (image:178) ramdisk        = /boot/initrd-
2.6.16-xen-xensrv.img
[2006-05-22 00:13:02 xend] DEBUG (image:179) vcpus          = 1
[2006-05-22 00:13:02 xend] DEBUG (image:180) features       =
[2006-05-22 00:13:03 xend] DEBUG (blkif:24) exception looking up device number for sda1: [Errno 2] No such file or directory: '/dev/sda1'
[2006-05-22 00:13:03 xend] DEBUG (DevController:103) DevController: writing {'virtual-device': '2049', 'backend-id': '0', 'state': '1', 'backend': '/local/domain/0/backend/vbd/11/2049'} to /local/domain/11/device/vbd/2049.
[2006-05-22 00:13:03 xend] DEBUG (DevController:105) DevController: writing {'domain': 'xen3', 'frontend': '/local/domain/11/device/vbd/2049', 'dev': 'sda1', 'state': '1', 'params': '/dev/xen001/xen2-fun', 'mode': 'w', 'frontend-id': '11', 'type': 'phy'} to /local/domain/0/backend/vbd/11/2049.
[2006-05-22 00:13:03 xend] DEBUG (blkif:24) exception looking up device number for sda2: [Errno 2] No such file or directory: '/dev/sda2'
[2006-05-22 00:13:03 xend] DEBUG (DevController:103) DevController: writing {'virtual-device': '2050', 'backend-id': '0', 'state': '1', 'backend': '/local/domain/0/backend/vbd/11/2050'} to /local/domain/11/device/vbd/2050.
[2006-05-22 00:13:03 xend] DEBUG (DevController:105) DevController: writing {'domain': 'xen3', 'frontend': '/local/domain/11/device/vbd/2050', 'dev': 'sda2', 'state': '1', 'params': '/dev/xen001/xen2-fun-swap', 'mode': 'w', 'frontend-id': '11', 'type': 'phy'} to /local/domain/0/backend/vbd/11/2050.
[2006-05-22 00:13:03 xend] DEBUG (DevController:103) DevController: writing {'backend-id': '0', 'mac': 'AA:00:00:18:98:FD', 'handle': '0', 'state': '1', 'backend': '/local/domain/0/backend/vif/11/0'} to /local/domain/11/device/vif/0.
[2006-05-22 00:13:03 xend] DEBUG (DevController:105) DevController: writing {'domain': 'xen3', 'handle': '0', 'script': '/etc/xen/scripts/vif-route2', 'ip': 'x.x.x.x', 'state': '1', 'frontend': '/local/domain/11/device/vif/0', 'mac': 'AA:00:00:18:98:FD', 'vifname': 'vm03', 'frontend-id': '11'} to /local/domain/0/backend/vif/11/0.
[2006-05-22 00:13:03 xend.XendDomainInfo] DEBUG (XendDomainInfo:671) Storing VM details: {'ssidref': '0', 'uuid': '772962af-a18f-c8d9-623a-303d0ec50175', 'on_reboot': 'restart', 'start_time': '1148236983.14', 'on_poweroff': 'destroy', 'name': 'xen3', 'vcpus': '1', 'vcpu_avail': '1', 'memory': '128', 'on_crash': 'restart', 'image': "(linux (kernel /boot/vmlinuz-
2.6.16-xen-xensrv) (ramdisk /boot/initrd-2.6.16-xen-xensrv.img) (ip x.x.x.x:1.2.3.4:y.y.y.y:255.255.255.240::eth0:off) (root '/dev/sda1 ro') (args 'selinux=0'))", 'maxmem': '128'}
[2006-05-22 00:13:03 xend.XendDomainInfo
] DEBUG (XendDomainInfo:696) Storing domain details: {'console/ring-ref': '92531', 'console/port': '2', 'name': 'xen3', 'console/limit': '1048576', 'vm': '/vm/772962af-a18f-c8d9-623a-303d0ec50175', 'domid': '11', 'cpu/0/availability': 'online', 'memory/target': '131072', 'store/ring-ref': '92532', 'store/port': '1'}
[2006-05-22 00:13:03 xend.XendDomainInfo] DEBUG (XendDomainInfo:877) XendDomainInfo.handleShutdownWatch
[2006-05-22 00:13:03 xend] DEBUG (DevController:132) Waiting for devices vif.
[2006-05-22 00:13:03 xend] DEBUG (DevController:138) Waiting for 0.
[2006-05-22 00:13:03 xend] DEBUG (DevController:403) hotplugStatusCallback /local/domain/0/backend/vif/11/0/hotplug-status.
[2006-05-22 00:13:05 xend] DEBUG (DevController:403) hotplugStatusCallback /local/domain/0/backend/vif/11/0/hotplug-status.
[2006-05-22 00:13:05 xend] DEBUG (DevController:417) hotplugStatusCallback 2.
[2006-05-22 00:13:05 xend.XendDomainInfo] DEBUG (XendDomainInfo:1327) XendDomainInfo.destroy: domid=11
[2006-05-22 00:13:05 xend.XendDomainInfo
] DEBUG (XendDomainInfo:1335) XendDomainInfo.destroyDomain(11)

Noticing the following:

[2006-05-22 00:13:03 xend] DEBUG
(blkif:24) exception looking up device number for sda1: [Errno 2] No
such file or directory: '/dev/sda1'
[2006-05-22 00:13:03 xend] DEBUG
(blkif:24) exception looking up device number for sda2: [Errno 2] No
such file or directory: '/dev/sda2'

I checked the image and it has /dev/sda1 and /dev/sda2 in it. Any ideas on why it is giving this error ?

Just on a side note the existing domain which is running also has /dev/sda1 and /dev/sda2 used in it for main image and swap (does that make a difference ?? I tried to make it /dev/sda3 and /dev/sda4 for the new domain however the same error persists)

Any help on this would be appreciated.

-- 
regards,

Anand Gupta
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