Created attachment 484029 [details]
vdsm logs.

Description of problem:

running on small scale system, with new meta-data, at some point, rhevm decided to deactivate storage domain due too problematic state (high latency), and sent deactivate storage domain, vdsm started to process this command, but never returns valid response code (greped all logs), and looks like this: 
------------------------------------------------------------------------------
Thread-86543::INFO::2011-03-12 15:36:31,328::dispatcher::94::Storage.Dispatcher.Protect::(run) Run and protect: deactivateStorageDomain, args: ( sdUUID=aa6a8d5
3-8c0a-4be1-865e-452948c2ef83 spUUID=a8e3a5e0-1437-4dfb-9ac5-c6835227a074 msdUUID=00000000-0000-0000-0000-000000000000 masterVersion=146)
Thread-86543::DEBUG::2011-03-12 15:36:31,684::task::491::TaskManager.Task::(_debug) Task f3e5ac66-b788-414f-a57f-ff9b35e7c97c: moving from state init -> state
preparing
------------------------------------------------------------------------------

then, I see few logs regarding this thread, at some point it goes to sleep for 2 minutes (didn't manage to acquire resource), and then i see the following:
------------------------------------------------------------------------------
Thread-86543::INFO::2011-03-12 15:38:18,908::sp::942::Storage.StoragePool::(deactivateSD) sdUUID=aa6a8d53-8c0a-4be1-865e-452948c2ef83 spUUID=a8e3a5e0-1437-4dfb-9ac5-c6835227a074 msdUUID=00000000-0000-0000-0000-000000000000
------------------------------------------------------------------------------

no return response what so ever, towards the end of log, i get the following errors, but non over that specific SD: 
------------------------------------------------------------------------------
- RuntimeError: _handleRequests._checkForMail - Could not read mailbox
- AttributeError: 'NoneType' object has no attribute 'partial'

[root@rhev-i32c-01 vdsm]# zgrep  deactivateStorage /var/log/vdsm/vdsm.log.*  |grep aa6a8d53-8c0a-4be1-865e-452948c2ef83 | grep Run

/var/log/vdsm/var/log/vdsm/vdsm.log.27.gz:Thread-86543::INFO::2011-03-12 15:36:31,328::dispatcher::94::Storage.Dispatcher.Protect::(run) Run and protect: deactivateStorageDomain, args: ( sdUUID=aa6a8d53-8c0a-4be1-865e-452948c2ef83 spUUID=a8e3a5e0-1437-4dfb-9ac5-c6835227a074 msdUUID=00000000-0000-0000-0000-000000000000 masterVersion=146)

/var/log/vdsm/vdsm.log.42.gz:Thread-63070::INFO::2011-03-12 00:27:12,374::dispatcher::94::Storage.Dispatcher.Protect::(run) Run and protect: deactivateStorageDomain, args: ( sdUUID=aa6a8d53-8c0a-4be1-865e-452948c2ef83 spUUID=a8e3a5e0-1437-4dfb-9ac5-c6835227a074 msdUUID=00000000-0000-0000-0000-000000000000 masterVersion=141)

result: 

vg is activate, but has no link in '/rhev/data-center/mnt/blockSD/', backend rollbacked command, and 'thinks' vg (domain) is up, meaning, totally a mess.

setup:

1) fcp
2) 31 storage domains 
3) vm load - 194