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cluster failover --memory


cluster failover --memory

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muth_51
muth_51
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CLR is enabled and the server holds linked servers. Maxdop setting is 4. For CPU settings, both processor affinity mask and i/o affinity mask were checked. We also have extended stored procs on the servers.
Perry Whittle
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How physical do you have and what is max server mem set to?

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"Ya can't make an omelette without breaking just a few eggs" ;-)
muth_51
muth_51
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500 GB RAM. 425 GB max memory setting.
sqlbuddy123
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muthyala_51 (3/10/2014)
CLR is enabled and the server holds linked servers. Maxdop setting is 4. For CPU settings, both processor affinity mask and i/o affinity mask were checked. We also have extended stored procs on the servers.


Did you check for any CPU pressure on the server ? Especially due to MAXDOP. Check for CX_Packet WAITS.

You should try to tune Worker Threads and MAXDOP settings for further troubleshooting.

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SQLBuddy
sqlbuddy123
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What's your SQL Build no ? Also try to collect these counters (Perfmon) which gives us more insight ..

Processor – %Privileged Time
Processor – %Processor Time
Processor – %Interrupt Time
Processor – Interrupts\Sec
Process(sqlservr) - %Processor Time
System – Processor Queue Length
System - Processor Queue Length
System - Context Switches/sec
SQLServer:SQL Statistics Compilations/sec
SQLServer:SQL Statistics Re-Compilations/sec

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Perry Whittle
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muthyala_51 (3/11/2014)
500 GB RAM

Bit of an odd figure, i'm assuming that's 512GB RAM?

muthyala_51 (3/11/2014)
425 GB max memory setting.

Given the fact you have a lot of CLR and ext stored proc, etc i would lower the max memory setting a little. Monitor the server and if necessary increase or decrease again. My temptation would be to lower it to 384GB and then monitor.

You have to reserve enough RAM for the following

Ext Stored Proc
CLR
Windows OS mem manager
Any other apps running on the server

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"Ya can't make an omelette without breaking just a few eggs" ;-)
muth_51
muth_51
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muthyala_51 (3/11/2014)
425 GB max memory setting.
Given the fact you have a lot of CLR and ext stored proc, etc i would lower the max memory setting a little. Monitor the server and if necessary increase or decrease again. My temptation would be to lower it to 384GB and then monitor.

You have to reserve enough RAM for the following

Ext Stored Proc
CLR
Windows OS mem manager
Any other apps running on the server


But during the downtime all the memory was able to windows. As the sql server was just trying to grab memory from the windows after restart.
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