Does Always On Availability Group supports Clustered Shared Volumes (CSV) ??

Hi All,

Environment - SQL 2012 Enterprise SP3 Stand-Alone Storage - CSVs

We are using AlwaysOn Availability Group setup for SharePoint Databases and from last 2 instances we noticed when we do Transaction Log Shrink operation (small chunks ~500MB) there are I/O issues recorded in the SQL Error Logs and the SharePoint goes down for couple of minutes.


  • Does AlwaysOn Availability Group supports CSVs?

  • Can a shrink operation became cause for the I/O issues?

Thank you in advance for your answers, I'll be awaiting to hear about it.

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asked May 11, 2017 at 02:47 PM in Default

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Can a shrink operation become the cause for the I/O issues? It is probably more the opposite - I/O issues are causing shrink operation or other performance issues. Can you run these queries and post the results when the shrink operation is occurring?

     COUNT (*) AS [PendingIOs],
     DB_NAME ([vfs].[database_id]) AS [DBName],
     [mf].[name] AS [FileName],
     [mf].[type_desc] AS [FileType],
     SUM ([pior].[io_pending_ms_ticks]) AS [TotalStall]
 FROM sys.dm_io_pending_io_requests AS [pior]
 JOIN sys.dm_io_virtual_file_stats (NULL, NULL) AS [vfs]
     ON [vfs].[file_handle] = [pior].[io_handle]
 JOIN sys.master_files AS [mf]
     ON [mf].[database_id] = [vfs].[database_id]
     AND [mf].[file_id] = [vfs].[file_id]
    [pior].[io_pending] = 1
 GROUP BY [vfs].[database_id], [mf].[name], [mf].[type_desc]
 ORDER BY [vfs].[database_id], [mf].[name];
 SELECT [log_reuse_wait_desc]
     FROM sys.databases
     --WHERE [name] = N'';

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answered May 11, 2017 at 03:32 PM

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Thank you for the note and the query, the situation is not yet repeated and we have not shrunk the files. We will soon do it in Off Business hours and will send the output.

May 16, 2017 at 09:20 AM godszell
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asked: May 11, 2017 at 02:47 PM

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Last Updated: May 16, 2017 at 09:20 AM

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