I paste only a part from syslog... here attached the rest...

Here are the warnings about the vif-devices (xend.log):


2008-03-11 17:38:05 6541] INFO (SrvDaemon:331) Xend Daemon started
[2008-03-11 17:38:05 6541] INFO (SrvDaemon:335) Xend changeset: unavailable.
[2008-03-11 17:38:05 6541] INFO (SrvDaemon:342) Xend version: Unknown.
[2008-03-11 17:38:05 6541] DEBUG (XendDomainInfo:132) XendDomainInfo.recreate({'max_vcpu_id': 3, 'cpu_time': 315127662538L, 'ssidref': 120, 'hvm': 0, 'shutdown_reason': 0, 'dying': 0, 'online_vcpus': 4, 'domid': 0, 'paused': 0, 'crashed': 0, 'running': 1, 'maxmem_kb': 4294967292L, 'shutdown': 0, 'mem_kb': 8180736L, 'handle': [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], 'blocked': 0, 'name': 'Domain-0'})
[2008-03-11 17:38:05 6541] INFO (XendDomainInfo:149) Recreating domain 0, UUID 00000000-0000-0000-0000-000000000000. at /local/domain/0
[2008-03-11 17:38:05 6541] DEBUG (XendDomainInfo:2211) Storing VM details: {'on_xend_stop': 'ignore', 'shadow_memory': '0', 'uuid': '00000000-0000-0000-0000-000000000000', 'on_reboot': 'restart', 'image': '(linux (kernel ))', 'on_poweroff': 'destroy', 'on_xend_start': 'ignore', 'on_crash': 'restart', 'xend/restart_count': '0', 'vcpus': '4', 'vcpu_avail': '15', 'name': 'Domain-0'}
[2008-03-11 17:38:05 6541] DEBUG (XendDomainInfo:1027) Storing domain details: {'cpu/3/availability': 'online', 'name': 'Domain-0', 'console/limit': '1048576', 'memory/target': '8180736', 'cpu/2/availability': 'online', 'vm': '/vm/00000000-0000-0000-0000-000000000000', 'domid': '0', 'security_label': '', 'cpu/0/availability': 'online', 'cpu/1/availability': 'online', 'control/platform-feature-multiprocessor-suspend': '1', 'console/type': 'xenconsoled'}
[2008-03-11 17:38:05 6541] DEBUG (XendDomain:443) Adding Domain: 0
[2008-03-11 17:38:05 6541] DEBUG (XendDomain:379) number of vcpus to use is 0
[2008-03-11 17:38:05 6541] DEBUG (XendDomainInfo:1111) XendDomainInfo.handleShutdownWatch
[2008-03-11 17:38:05 6541] WARNING (XendAPI:678) API call: VBD.set_device not found
[2008-03-11 17:38:05 6541] WARNING (XendAPI:678) API call: VBD.set_type not found
[2008-03-11 17:38:05 6541] WARNING (XendAPI:678) API call: session.get_all_records not found
[2008-03-11 17:38:05 6541] WARNING (XendAPI:678) API call: event.get_record not found
[2008-03-11 17:38:05 6541] WARNING (XendAPI:678) API call: event.get_all not found
[2008-03-11 17:38:05 6541] WARNING (XendAPI:678) API call: VM.get_auto_power_on not found
[2008-03-11 17:38:05 6541] WARNING (XendAPI:678) API call: VM.set_auto_power_on not found
[2008-03-11 17:38:05 6541] WARNING (XendAPI:678) API call: VIF.get_network not found
[2008-03-11 17:38:05 6541] WARNING (XendAPI:678) API call: VIF.set_device not found
[2008-03-11 17:38:05 6541] WARNING (XendAPI:678) API call: VIF.set_MAC not found
[2008-03-11 17:38:05 6541] WARNING (XendAPI:678) API call: VIF.set_MTU not found
[2008-03-11 17:38:05 6541] WARNING (XendAPI:678) API call: debug.get_all not found
[2008-03-11 17:38:05 6541] INFO (XMLRPCServer:149) Opening Unix domain socket XML-RPC server on /var/run/xend/xen-api.sock; authentication has been disabled for this server.
[2008-03-11 17:38:05 6541] INFO (XMLRPCServer:149) Opening Unix domain socket XML-RPC server on /var/run/xend/xmlrpc.sock.
[2008-03-11 17:41:10 6541] DEBUG (SrvServer:76) SrvServer.cleanup()
[2008-03-11 17:41:10 6541] DEBUG (XMLRPCServer:228) XMLRPCServer.cleanup()
[2008-03-11 17:41:10 6541] DEBUG (XMLRPCServer:228) XMLRPCServer.cleanup()
[2008-03-11 17:41:10 6541] DEBUG (XendDomain:609) cleanup_domains
[2008-03-11 17:41:10 6539] INFO (SrvDaemon:219) Xend exited with status 0.
[2008-03-11 17:41:10 6627] INFO (SrvDaemon:331) Xend Daemon started
[2008-03-11 17:41:10 6627] INFO (SrvDaemon:335) Xend changeset: unavailable.
[2008-03-11 17:41:10 6627] INFO (SrvDaemon:342) Xend version: Unknown.
[2008-03-11 17:41:10 6627] DEBUG (XendDomainInfo:132) XendDomainInfo.recreate({'max_vcpu_id': 3, 'cpu_time': 323796965072L, 'ssidref': 120, 'hvm': 0, 'shutdown_reason': 0, 'dying': 0, 'online_vcpus': 4, 'domid': 0, 'paused': 0, 'crashed': 0, 'running': 1, 'maxmem_kb': 4294967292L, 'shutdown': 0, 'mem_kb': 8180736L, 'handle': [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], 'blocked': 0, 'name': 'Domain-0'})
[2008-03-11 17:41:10 6627] INFO (XendDomainInfo:149) Recreating domain 0, UUID 00000000-0000-0000-0000-000000000000. at /local/domain/0
[2008-03-11 17:41:10 6627] DEBUG (XendDomainInfo:1111) XendDomainInfo.handleShutdownWatch
[2008-03-11 17:41:10 6627] DEBUG (XendDomain:443) Adding Domain: 0
[2008-03-11 17:41:10 6627] DEBUG (XendDomain:379) number of vcpus to use is 0
[2008-03-11 17:41:10 6627] WARNING (XendAPI:678) API call: VBD.set_device not found
[2008-03-11 17:41:10 6627] WARNING (XendAPI:678) API call: VBD.set_type not found
[2008-03-11 17:41:10 6627] WARNING (XendAPI:678) API call: session.get_all_records not found
[2008-03-11 17:41:10 6627] WARNING (XendAPI:678) API call: event.get_record not found
[2008-03-11 17:41:10 6627] WARNING (XendAPI:678) API call: event.get_all not found
[2008-03-11 17:41:10 6627] WARNING (XendAPI:678) API call: VM.get_auto_power_on not found
[2008-03-11 17:41:10 6627] WARNING (XendAPI:678) API call: VM.set_auto_power_on not found
[2008-03-11 17:41:10 6627] WARNING (XendAPI:678) API call: VIF.get_network not found
[2008-03-11 17:41:10 6627] WARNING (XendAPI:678) API call: VIF.set_device not found
[2008-03-11 17:41:10 6627] WARNING (XendAPI:678) API call: VIF.set_MAC not found
[2008-03-11 17:41:10 6627] WARNING (XendAPI:678) API call: VIF.set_MTU not found
[2008-03-11 17:41:10 6627] WARNING (XendAPI:678) API call: debug.get_all not found
[2008-03-11 17:41:10 6627] INFO (XMLRPCServer:149) Opening Unix domain socket XML-RPC server on /var/run/xend/xen-api.sock; authentication has been disabled for this server.
[2008-03-11 17:41:10 6627] INFO (XMLRPCServer:149) Opening Unix domain socket XML-RPC server on /var/run/xend/xmlrpc.sock.