there is a weird error in mms console:
2011-04-29 20:33:16,507 ERROR serverStatusThread:msg: host: SN12:27017 - exception:db assertion failure, assertion: 'all servers down!', assertionCode: 8002
Traceback (most recent call last):
File "agent.py", line 449, in serverStatusThread
stats = collectStats( monitorConn, settings.sendProfilerData )
File "agent.py", line 170, in collectStats
for x in conn.database_names():
File "build/bdist.linux-i686/egg/pymongo/connection.py", line 902, in database_names
self.admin.command("listDatabases")["databases"]]
File "build/bdist.linux-i686/egg/pymongo/database.py", line 293, in command
msg, allowable_errors)
File "build/bdist.linux-i686/egg/pymongo/helpers.py", line 125, in _check_command_response
raise OperationFailure(ex_msg, response.get("assertionCode"))
OperationFailure: db assertion failure, assertion: 'all servers down!', assertionCode: 8002

enclosed is the mongos side at the same time:
Fri Apr 29 20:33:16 [conn34588] SyncClusterConnection connecting to [amdbm001:10001]
Fri Apr 29 20:33:16 [conn34588] SyncClusterConnection connecting to [amdbm003:10001]
Fri Apr 29 20:33:16 [conn34588] SyncClusterConnection connecting to [amdbm005:10001]
Fri Apr 29 20:33:16 [conn34588] DBClientCursor::init call() failed
Fri Apr 29 20:33:16 [conn34588] query failed to: amdbm001:10001 no data
Fri Apr 29 20:33:16 [conn34588] DBClientCursor::init call() failed
Fri Apr 29 20:33:16 [conn34588] query failed to: amdbm003:10001 no data
Fri Apr 29 20:33:16 [conn34588] DBClientCursor::init call() failed
Fri Apr 29 20:33:16 [conn34588] query failed to: amdbm005:10001 no data
Fri Apr 29 20:33:16 [conn34588] ~ScopedDbConnection: _conn != null

please advice,
ofer