Re: [Xen-users] Only able to start 2 domUs

["Serge Dubrouski" <sergeyfd@xxxxxxxxx>]

Probably you have only 2 loop devices configured in the kernel. Try to
set max_loop on the Dom0 kernel:

http://wiki.xensource.com/xenwiki/XenFaq#head-b4167b873a6b3a6657ecf9339c44e4a0692f8ada

Serge.

On 6/16/06, Eric E <whalesuit@xxxxxxxxx> wrote:
> 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)
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users