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Communication Link failure


Communication Link failure

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scorpianprince
scorpianprince
Say Hey Kid
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Group: General Forum Members
Points: 692 Visits: 53
Hi all,

can anyone tell me about the error that i am getting in the error log and what can be the cause of this error and what can be done to resolve this error :-

Date 1/18/2011 2:14:32 PM
Log SQL Agent (Current - 1/18/2011 2:14:00 PM)

Message
[298] SQLServer Error: 16389, Communication link failure [SQLSTATE 08S01]

NEVER NEVER EVER GIVE UP;-)
Adiga
Adiga
One Orange Chip
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Group: General Forum Members
Points: 25012 Visits: 21012
These errors are usually logged in the Agent Log or by the application when the SQL Server instance low on memory or the underlying storage is having some issues. You may find the below links useful.

http://sqlblog.com/blogs/merrill_aldrich/archive/2010/06/22/long-i-os-and-tcp-timeouts-are-not-a-sql-server-problem-except-when-they-are.aspx

http://social.msdn.microsoft.com/Forums/en/sqldatabaseengine/thread/1536b610-e548-40c1-b9d0-1be3ad19a823

Pradeep Adiga
Blog: sqldbadiaries.com
Twitter: @pradeepadiga
scorpianprince
scorpianprince
Say Hey Kid
Say Hey Kid (692 reputation)Say Hey Kid (692 reputation)Say Hey Kid (692 reputation)Say Hey Kid (692 reputation)Say Hey Kid (692 reputation)Say Hey Kid (692 reputation)Say Hey Kid (692 reputation)Say Hey Kid (692 reputation)

Group: General Forum Members
Points: 692 Visits: 53
Thanks for the Reply. The Links are really helpful

About my findings:-
The main reason after our analysis is coming out to be the I/O latch and the avg cpu utilisation of the server is 40% and most of the time the SQL server is waiting to read from the disk drive.
Also the Db files are actively/continuously scanned by the Antivirus

So can you suggest what can be done

Also today i have the following error can you help me why this came

Date 1/19/2011 12:37:15 PM
Log SQL Agent (Current - 1/19/2011 12:40:00 PM)

Message
[298] SQLServer Error: 121, TCP Provider: The semaphore timeout period has expired. [SQLSTATE 08S01]

Should i go to the network team for the connectivity issue or the storage team to check the storage as it is taking time to read from the SAN Drives.

NEVER NEVER EVER GIVE UP;-)
Adiga
Adiga
One Orange Chip
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Group: General Forum Members
Points: 25012 Visits: 21012
Please involve the storage team to check for any issues with the storage or if any of the drivers need to be updated.

Also inform the Windows Administrators to configure the Antivirus software to exclude the database files.

Pradeep Adiga
Blog: sqldbadiaries.com
Twitter: @pradeepadiga
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