[Xen-users] Only able to start 2 domUs

[Eric E <whalesuit@xxxxxxxxx>]

Hi,
   I've been running Xen 2.0.7 successfully on Suse 9.3 for some time.  
Recently I installed Xen 3.0 on SLES9, and have been able to get domains 
running just fine.  I've recently run into a problem: I can only launch 
2 domains at once.  When I attempt to launch the third domain, I get:
Error: Device 2049 (vbd) could not be connected. Backend device not found.
Taking one down allows me to start a different domain, so each works 
when only one other is up.
I'm running this on a Dell PowerEdge 2850 with 6GB of RAM and two NICs, 
respectively called eth0 and eth1.  I've assigned random, made-up MAC 
addresses to each, and no files or partitions are being re-used.  We had 
to assign eth1 to a bridge xenbr1 in order to get xenbr0 to work, but we 
do not use eth1 or xenbr1 at the moment.  Xend-log output follows
Does anyone have any idea why a third domain won't boot?

Thanks,

Eric



[2006-06-16 20:43:48 xend] INFO (image:135) buildDomain os=linux dom=24 
vcpus=1
[2006-06-16 20:43:48 xend] DEBUG (image:173) dom            = 24
[2006-06-16 20:43:48 xend] DEBUG (image:174) image          = 
/boot/vmlinuz-2.6-xen
[2006-06-16 20:43:48 xend] DEBUG (image:175) store_evtchn   = 1
[2006-06-16 20:43:48 xend] DEBUG (image:176) console_evtchn = 2
[2006-06-16 20:43:48 xend] DEBUG (image:177) cmdline        =  
root=/dev/sda1 rw 3
[2006-06-16 20:43:48 xend] DEBUG (image:178) ramdisk        = 
/boot/initrd-xen
[2006-06-16 20:43:48 xend] DEBUG (image:179) vcpus          = 1
[2006-06-16 20:43:48 xend] DEBUG (image:180) features       =
[2006-06-16 20:43:48 xend] DEBUG (DevController:103) DevController: 
writing {'virtual-device': '2049', 'backend-id': '0', 'state': '1', 
'backend': '/local/domain/0/backend/vbd/24/2049'} to 
/local/domain/24/device/vbd/2049.
[2006-06-16 20:43:48 xend] DEBUG (DevController:105) DevController: 
writing {'domain': 'limsdev', 'frontend': 
'/local/domain/24/device/vbd/2049', 'dev': 'sda1', 'state': '1', 
'params': '/mnt/images/limsdev_pgsql_xen.img', 'mode': 'w', 
'frontend-id': '24', 'type': 'file'} to /local/domain/0/backend/vbd/24/2049.
[2006-06-16 20:43:48 xend] DEBUG (DevController:103) DevController: 
writing {'virtual-device': '2050', 'backend-id': '0', 'state': '1', 
'backend': '/local/domain/0/backend/vbd/24/2050'} to 
/local/domain/24/device/vbd/2050.
[2006-06-16 20:43:48 xend] DEBUG (DevController:105) DevController: 
writing {'domain': 'limsdev', 'frontend': 
'/local/domain/24/device/vbd/2050', 'dev': 'sda2', 'state': '1', 
'params': '/dev/system_lvm/limsdev_data', 'mode': 'w', 'frontend-id': 
'24', 'type': 'phy'} to /local/domain/0/backend/vbd/24/2050.
[2006-06-16 20:43:48 xend] DEBUG (DevController:103) DevController: 
writing {'backend-id': '0', 'mac': '00:16:3e:aa:06:21', 'handle': '0', 
'state': '1', 'backend': '/local/domain/0/backend/vif/24/0'} to 
/local/domain/24/device/vif/0.
[2006-06-16 20:43:48 xend] DEBUG (DevController:105) DevController: 
writing {'bridge': 'xenbr0', 'domain': 'limsdev', 'handle': '0', 
'script': '/etc/xen/scripts/vif-bridge', 'state': '1', 'frontend': 
'/local/domain/24/device/vif/0', 'mac': '00:16:3e:aa:06:21', 
'frontend-id': '24'} to /local/domain/0/backend/vif/24/0.
[2006-06-16 20:43:48 xend.XendDomainInfo] DEBUG (XendDomainInfo:671) 
Storing VM details: {'ssidref': '0', 'uuid': 
'e832ec8c-9eb7-d851-234b-4cd81c279d06', 'on_reboot': 'restart', 
'start_time': '1150505028.48', 'on_poweroff': 'destroy', 'name': 
'limsdev', 'vcpus': '1', 'vcpu_avail': '1', 'memory': '400', 'on_crash': 
'restart', 'image': "(linux (kernel /boot/vmlinuz-2.6-xen) (ramdisk 
/boot/initrd-xen) (root '/dev/sda1 rw') (args 3))", 'maxmem': '400'}
[2006-06-16 20:43:48 xend.XendDomainInfo] DEBUG (XendDomainInfo:696) 
Storing domain details: {'console/ring-ref': '209107', 'console/port': 
'2', 'name': 'limsdev', 'console/limit': '1048576', 'vm': 
'/vm/e832ec8c-9eb7-d851-234b-4cd81c279d06', 'domid': '24', 
'cpu/0/availability': 'online', 'memory/target': '409600', 
'store/ring-ref': '209108', 'store/port': '1'}
[2006-06-16 20:43:48 xend.XendDomainInfo] DEBUG (XendDomainInfo:877) 
XendDomainInfo.handleShutdownWatch
[2006-06-16 20:43:48 xend] DEBUG (DevController:132) Waiting for devices 
vif.
[2006-06-16 20:43:48 xend] DEBUG (DevController:138) Waiting for 0.
[2006-06-16 20:43:48 xend] DEBUG (DevController:403) 
hotplugStatusCallback /local/domain/0/backend/vif/24/0/hotplug-status.
[2006-06-16 20:43:54 xend] DEBUG (DevController:403) 
hotplugStatusCallback /local/domain/0/backend/vif/24/0/hotplug-status.
[2006-06-16 20:43:54 xend] DEBUG (DevController:417) 
hotplugStatusCallback 1.
[2006-06-16 20:43:54 xend] DEBUG (DevController:132) Waiting for devices 
usb.
[2006-06-16 20:43:54 xend] DEBUG (DevController:132) Waiting for devices 
vbd.
[2006-06-16 20:43:54 xend] DEBUG (DevController:138) Waiting for 2049.
[2006-06-16 20:43:54 xend] DEBUG (DevController:403) 
hotplugStatusCallback /local/domain/0/backend/vbd/24/2049/hotplug-status.
[2006-06-16 20:43:54 xend] DEBUG (DevController:417) 
hotplugStatusCallback 2.
[2006-06-16 20:43:54 xend.XendDomainInfo] DEBUG (XendDomainInfo:1327) 
XendDomainInfo.destroy: domid=24
[2006-06-16 20:43:54 xend.XendDomainInfo] DEBUG (XendDomainInfo:1335) 
XendDomainInfo.destroyDomain(24)
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