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start nova-compute failure

Hi experts,

when I run the command(nova-manage service list), I get the below output root@Userver2:~# nova-manage service list 2012-09-21 17:36:49 DEBUG nova.utils [req-db670af0-2d15-4607-a23d-72dd7d97cb0d None None] backend <module 'nova.db.sqlalchemy.api'="" from="" '="" usr="" lib="" python2.7="" dist-packages="" nova="" db="" sqlalchemy="" api.pyc'=""> from (pid=10876) __get_backend /usr/lib/python2.7/dist-packages/nova/utils.py:658 Binary Host Zone Status State Updated_At nova-consoleauth userver1.matrix.com nova enabled :-) 2012-09-21 09:36:45 nova-compute userver1.matrix.com nova enabled XXX 2012-09-21 01:38:53 nova-compute Userver2 nova enabled :-) 2012-09-21 09:36:42 nova-volume userver1.matrix.com nova enabled :-) 2012-09-21 09:36:49 nova-network userver1.matrix.com nova enabled :-) 2012-09-21 09:36:42 nova-scheduler userver1.matrix.com nova enabled :-) 2012-09-21 09:36:41 nova-cert userver1.matrix.com nova enabled :-) 2012-09-21 09:36:48

I noticed that the nova-compute serice can not start. then I run the command (start nova-compute), and I get the following error in the /var/log/nova/nova-compute.log.

2012-09-21 17:29:52 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 114, in wrapped 2012-09-21 17:29:52 TRACE nova return f(args, *kw) 2012-09-21 17:29:52 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/connection.py", line 718, in reboot 2012-09-21 17:29:52 TRACE nova if self._soft_reboot(instance): 2012-09-21 17:29:52 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/connection.py", line 754, in _soft_reboot 2012-09-21 17:29:52 TRACE nova dom.create() 2012-09-21 17:29:52 TRACE nova File "/usr/lib/python2.7/dist-packages/libvirt.py", line 551, in create 2012-09-21 17:29:52 TRACE nova if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self) 2012-09-21 17:29:52 TRACE nova libvirtError: Unable to allow access for disk path /dev/disk/by-path/ip-192.168.172.14:3260-iscsi-iqn.2010-10.org.openstack:volume-00000004-lun-1: No such file or directory 2012-09-21 17:29:52 TRACE nova

Did anyone encounter the same issues?

pls give me some advice to fix it Any help would be appreciated.