[CentOS] virtual machines refuse to start up

Sat Jan 1 18:16:55 UTC 2011
benedict dcunha <sylvan.dcunha at gmail.com>

Dear All,

 am new to xen and recently implemented it.
i had some issues initially but googling arround and some wise replies from
you guys out there managed to clear them.

now I have 2 virtual machines on my xen domains

one is windows 2003 and other windows2008

both the virtual machines were working fine for about a week

jus 2 days back we had a change in our network . i mean we rearanged the
vlans so the linux host server which runs xen was moved to another vlan
then i fould that i could not ping the linux xen host . on further
investigations i fould that there was another file created for my ethernet
device
ifcfg-eth1.bak and also ifcfg-eth1 existed. the ifcfg-eth0 existed as before


the right config for my eth1 was there in ifcfg-eth1.bak file so i renamed
the ifcfg-eth1.bak to ifcfg-eth1 and did a network service restart and then
found that i could reach the xen host server . but fould that one of my
virtual server was shut

i tried to restart it in virt-manager but it gave a error although the other
virtual machine was running

so i tried to restart my linux xen host server and then found that the
virtual server which was running also had not started .

so i tried to start it and it would not start and after long time gives
error

here below i paste the error message

googling arround did not lead me to any possible solution

really would apprecite if any guys out there would advice and help

thanks and regards

simon

-----------------------------
/var/messages log....

Jan 1 14:51:35 xenserver kernel: device vif19.0 left promiscuous mode
Jan 1 14:51:35 xenserver kernel: type=1700 audit(1293882695.424:69):
dev=vif19.0 prom=0 old_prom=256 auid=4294967295 ses=4294967295
Jan 1 14:51:35 xenserver kernel: xenbr1: port 4(vif19.0) entering disabled
state
Jan 1 14:51:36 xenserver avahi-daemon[3890]: Interface tap0.IPv6 no longer
relevant for mDNS.
Jan 1 14:51:36 xenserver avahi-daemon[3890]: Leaving mDNS multicast group on
interface tap0.IPv6 with address fe80::9cab:81ff:fec4:b1e8.
Jan 1 14:51:36 xenserver avahi-daemon[3890]: Withdrawing address record for
fe80::9cab:81ff:fec4:b1e8 on tap0.
Jan 1 14:51:36 xenserver kernel: xenbr1: port 3(tap0) entering disabled
state
Jan 1 14:51:36 xenserver kernel: device tap0 left promiscuous mode
Jan 1 14:51:36 xenserver kernel: type=1700 audit(1293882696.060:70):
dev=tap0 prom=0 old_prom=256 auid=4294967295 ses=4294967295
Jan 1 14:51:36 xenserver kernel: xenbr1: port 3(tap0) entering disabled
state

------------------------

part of /var/log/xen/xend.log

VmError: Device 5632 (vbd) could not be connected. Hotplug scripts not
working.
[2011-01-01 14:51:35 xend.XendDomainInfo 634] DEBUG (XendDomainInfo:2189)
XendDomainInfo.destroy: domid=19
[2011-01-01 14:51:35 xend.XendDomainInfo 634] INFO (XendDomainInfo:2330) Dev
768 still active, looping...
[2011-01-01 14:51:35 xend.XendDomainInfo 634] INFO (XendDomainInfo:2330) Dev
5632 still active, looping...
[2011-01-01 14:51:35 xend.XendDomainInfo 634] INFO (XendDomainInfo:2330) Dev
768 still active, looping...
[2011-01-01 14:51:35 xend.XendDomainInfo 634] INFO (XendDomainInfo:2330) Dev
5632 still active, looping...
[2011-01-01 14:51:35 xend.XendDomainInfo 634] INFO (XendDomainInfo:2330) Dev
768 still active, looping...
[2011-01-01 14:51:35 xend.XendDomainInfo 634] INFO (XendDomainInfo:2330) Dev
5632 still active, looping...
[2011-01-01 14:51:36 xend.XendDomainInfo 634] DEBUG (XendDomainInfo:2114)
UUID Created: True
[2011-01-01 14:51:36 xend.XendDomainInfo 634] DEBUG (XendDomainInfo:2115)
Devices to release: [], domid = 19
[2011-01-01 14:51:36 xend.XendDomainInfo 634] DEBUG (XendDomainInfo:2127)
Releasing PVFB backend devices ...
[2011-01-01 14:51:36 xend 634] DEBUG (DevController:509)
hotplugStatusCallback /local/domain/0/backend/vbd/19/5632/hotplug-status.
[2011-01-01 14:51:36 xend 634] DEBUG (DevController:509)
hotplugStatusCallback /local/domain/0/backend/vbd/19/5632/hotplug-status.
[2011-01-01 14:51:36 xend 634] DEBUG (DevController:509)
hotplugStatusCallback /local/domain/0/backend/vbd/18/5632/hotplug-status.
[2011-01-01 14:51:36 xend 634] DEBUG (DevController:509)
hotplugStatusCallback /local/domain/0/backend/vbd/19/5632/hotplug-status.
[2011-01-01 14:51:36 xend 634] DEBUG (DevController:509)
hotplugStatusCallback /local/domain/0/backend/vbd/18/5632/hotplug-status.
[2011-01-01 14:51:36 xend 634] DEBUG (DevController:509)
hotplugStatusCallback /local/domain/0/backend/vbd/19/5632/hotplug-status.

--------------

/var/log/xen/xen-hot-plug.log
Nothing to flush.
stat: cannot stat `/dev/scd0': No such file or directory
stat: cannot stat `/dev/scd0': No such file or directory


if you need more information it will be my utmost pleasure to provide you
the same
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