I'm looking to size the memory for a WIN2K8 (64bit) VM that has vCenter Server 4.x; SQL Server 2008 STD; VUM; vDR; vShield Zones, and will manage 4 hosts and about 25 vm's.
At the moment it has 4Gb of memory, but is alerting as it's using 90% of this. Any suggestions on the amount of memory i should give the VM?
Remember that Windows Server 2008 is more aggressive on memory... so could be normal to have 90% of usage.
With 4 host and 25 VM the minimum of 3 GB for vCenter Server could be fine.
But you have also to consider the SQL part (I suggest +1 GB) and the VUM part (in this case you can simple add 512 MB).
Also the vSphere client use a lot of memory resources.
IMHO I think that 5 GB could be a good value for your environment.
Keep in mind that with 64Bit W2k8 you are using Large Pages. Large pages aren't deduped by default. There also was an issue with the reporting of available memory as can be read in the article above. This issue has been fixed however: http://www.yellow-bricks.com/2009/09/25/fixed-memory-alarms-triggered-with-amd-rvi-and-intel-ept/
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