Any ideas on this one? (from VDSM log):
Thread-25::DEBUG::2013-01-22 15:35:29,065::BindingXMLRPC::914::vds::(wrapper) client [3.57.111.30]::call getCapabilities with () {}
Thread-25::ERROR::2013-01-22 15:35:29,113::netinfo::159::root::(speed) cannot read ib0 speed
Traceback (most recent call last):
File "/usr/lib64/python2.6/site-packages/vdsm/netinfo.py", line 155, in speed
s = int(file('/sys/class/net/%s/speed' % dev).read())
IOError: [Errno 22] Invalid argument

Causes VDSM to fail to attach storage

Engine side sees:
ERROR [org.ovirt.engine.core.bll.storage.NFSStorageHelper] (QuartzScheduler_Worker-96) [553ef26e] The connection with details 192.168.0.1:/ovirt/ds failed because of error code 100 and error message is: general exception
2013-01-22 15:35:30,160 INFO [org.ovirt.engine.core.bll.SetNonOperationalVdsCommand] (QuartzScheduler_Worker-96) [1ab78378] Running command: SetNonOperationalVdsCommand internal: true. Entities affected : ID: 8970b3fe-1faf-11e2-bc1f-00151712f280 Type: VDS
2013-01-22 15:35:30,200 INFO [org.ovirt.engine.core.vdsbroker.SetVdsStatusVDSCommand] (QuartzScheduler_Worker-96) [1ab78378] START, SetVdsStatusVDSCommand(HostName = kezan, HostId = 8970b3fe-1faf-11e2-bc1f-00151712f280, status=NonOperational, nonOperationalReason=STORAGE_DOMAIN_UNREACHABLE), log id: 4af5c4cd
2013-01-22 15:35:30,211 INFO [org.ovirt.engine.core.vdsbroker.SetVdsStatusVDSCommand] (QuartzScheduler_Worker-96) [1ab78378] FINISH, SetVdsStatusVDSCommand, log id: 4af5c4cd
2013-01-22 15:35:30,242 ERROR [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (QuartzScheduler_Worker-96) [1ab78378] Try to add duplicate audit log values with the same name. Type: VDS_SET_NONOPERATIONAL_DOMAIN. Value: storagepoolname

Engine = latest master

VDSM = latest master
node = el6