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sql server clustering : 16GB RAM AWE Failover vs. Stop/Start VirtInst w/3gb /pae ini


Lenny
8/24/2005 12:00:00 AM
I have installed 16 gigs of ram in 2 servers that each house a virtual
server\instance of SQL.

I have the /3gb sw and the /pae switch in the boot.ini and before
failing over the group i ran the following script:

sp_configure ’show advanced options’, 1
RECONFIGURE
GO
sp_configure ’awe enabled’, 1
RECONFIGURE
GO
sp_configure ’max server memory’, 6144
RECONFIGURE
GO


Instead of stopping sql server, I failed it over from node a to node
b. This took a little while but worked fine.

I proceeded to add the memory allocation to use 6 gigs on the other
node -b - and failed it over to node a.


After getting recovery complete for all my databases, I attempted to
move my first instance back to node a - which failed and then on its
own moved back to node b.

Please let me know if anyone has ran into this problem before and if I
should change something etc.
Thanks,
Lenny

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Geoff N. Hiten
8/24/2005 9:45:30 AM
This may be due to the OS not responding to the SQL memory request in time.
I had a similar problem with a 32GB/host node cluster and had to increase
the cluster resource pending timeout. Look at

AWE-Enabled SQL Server 2000 May Take a Long Time to Start
http://support.microsoft.com/default.aspx?scid=kb;en-us;329914

for a detailed explanation and how to adjust the timeout.

--
Geoff N. Hiten
Senior Database Administrator
Microsoft SQL Server MVP


[quoted text, click to view]

Pascal Deliot
9/15/2005 12:00:00 AM
Just a hint: if you are using AWE, try to avoid the use of the /3Gb flag.
This can push your server in big trouble if you have much RAM used on the
machine.

"Lenny" <UseLinkToEmail@dbForumz.com> a écrit dans le message de news:
4_866268_8d71c05d06d0903566b23849870c94af@dbforumz.com...
[quoted text, click to view]

Geoff N. Hiten
9/15/2005 12:55:58 PM
Correct. The breakover point seems to be around 12GB of physical RAM. Up
to that level, you can safely use /AWE and /3GB together. If you have more
memory than that, do not use /3GB.

--
Geoff N. Hiten
Senior Database Administrator
Microsoft SQL Server MVP

[quoted text, click to view]

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