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HADR_FILESTREAM_IOMGR

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Description:

This wait type is just as the Books Online description says.

(Books Online description: “The FILESTREAM AlwaysOn transport manager is waiting for R/W lock that protects the FILESTREAM AlwaysOn I/O manager during startup or shutdown.”)

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Added in SQL Server version:

2012

Removed in SQL Server version:

N/A

Extended Events wait_type value:

Maps to the HADRFS_IOMGR map_value in sys.dm_xe_map_values (thanks to Jonathan’s post here).

The map_key value in sys.dm_xe_map_values is 781 in 2012 and 799 in 2014 RTM. After 2014 RTM, you must check the DMV to get the latest value as some map_key values have changed in later builds.

Other information:

I have not seen this wait type be a noticeable contention point.

Known occurrences in SQL Server (list number matches call stack list):

  1. Waiting for synchronization while shutting down the FILESTREAM I/O manager for an availability group

And a few other similar call stacks.

Abbreviated call stacks (list number matches known occurrences list):

  1. SOS_Task::PostWait+9e
    EventInternal<SuspendQueueSLock>::Wait+1fb
    CHadrFsIoManager::Shutdown+116
    CDbmMsgDispatcher::ShutDown+2e4
    CServiceBrokerMgr::DoShutDown+57
    CServiceBrokerMgr::PrimaryEventHandler+368
    CSbEventHandler::Invoke+19
    CSbTask::TaskStart+14b
    CSbTask::BeginTaskStart+17
    SOS_Task::Param::Execute+21e
    SOS_Scheduler::RunTask+a8