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New SSD for VMware host cache

Benzino

Benzino

[H]ard|Gawd
Joined
Mar 3, 2005
Messages
1,710
I installed a Mushkin 60GB SSD in my ESXi whitebox (see sig) and configured it for host cache. I allocated 15GB initially. I mainly run Server 2012 and Windows 7 VM's with Exchagne 2013 and Lync 2013 for training purposes, so memory utilization will be high. Does VMware just pick up right away on the host cache configuation? Does it need a restart before the guests will utilize the SSD for what I assume is the pagefile for Windows guests? Or am I missing the point? :confused:

Thanks!
 
It's not for the Windows guest pagefile. It's for vSphere to swap to disk should it run out of memory.
 
NetJunkie said:
It's not for the Windows guest pagefile. It's for vSphere to swap to disk should it run out of memory.
Click to expand...

yup this. And more than likely you will not see any benefit from it unless you constantly swap to disk, which hopefully you arent anyway.

You would need to use something like netapps flashaccel or vmware is coming out or has some beta of a similar program that actually will support read caching for your guests with a local ssd.
 
Ok. I dug around a little more and it looks like I can configure each VM to point its pagefile to a different location if I choose, the default being with the datastore. Although it gives a nasty little message saying you may see a performance hit if you store the pagefile somewhere else. This is what I was looking for originally.

If all else fails I can use this little guy for staging new guests.
 
You may still be confused. The VM swap file is not the guest OS swap file. You can put the VM swap file on a different datastore from the VM (imho not good practice though it may be necessary), but the guest OS will create it's own swap file within the file system of the guest OS.

Generally speaking your system should be sized such that the VM swap file never gets used.
 
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