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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:
Removed in SQL Server version:
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.
I have not seen this wait type be a noticeable contention point.
Known occurrences in SQL Server (list number matches call stack list):
- 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):