Do you use pagefiles on Virtual Machines running on a Host with SSD?

I have a Server running two 1TB SSD Drives in a Raid 1. I loaded server 2012 with HyperV on it. I then loaded Virtual Servers on that. I took off the pagefile on the Host because it is SSD based off some best practices I read. However the Virtual Machines themselves have Pagefiles on them. Should I take them off? AND do best practices for servers with SSD apply to the virtual machines as well such as cutting off Indexing and TRIM etc?
aandoAsked:
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Mr TorturSystem EngineerCommented:
Hi,
I think there is nothing like some well identified best practices as SSD are evolving. You talk here about home computer with SSD best practices. But now SSD are more reliable, and I think you would not want your VM to have no pagefile at all in case you need to troubleshoot them after a crash, because you will have no dump.
I would not disable pagefiles if I were you, nor on host, nor on VM.
David Johnson, CD, MVPOwnerCommented:
Pagefiles are are required item for proper operation of all windows operating systems. Another item is using RAID1 which I'm assuming you did this for improved performance. In actual testing sometimes you get decreased performance in a RAID1 over just using the normal SATA/SAS interface.
Mr TorturSystem EngineerCommented:
I somehow agree, RAID 1 will bring you security in case of one SSD failure but can rather decrease your performances, especially writing performances.
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David Johnson, CD, MVPOwnerCommented:
RAID is not a replacement for a proper backup policy.. Just ask anyone that has suffered through cryptolocker
aandoAuthor Commented:
Well...yes I am using Raid 1 for a "fail safe" but we have backup as well. I am looking for best performance though. So would the idea be to have a Raid 0 with those two drives and just fall back on a backup if it crashes. I have seen backups fail to restore and I am not sure that is the wisest course of action to just rely on that either.
Mr TorturSystem EngineerCommented:
Hi again aando,
well you have your answer about pagefiles, or at least two advices, David Johnson's and mine.
About RAID 1 it depends of your use (personal, professional?) and criticity, but It could be just fine to went on RAID 1 if you have 2 SSD.
But :
- if there is no criticity at all you could go on RAID 0 which will have some more performance
- in RAID 1 you sacrifice half of your storage size, with RAID 0 you sacrifice nothing, but if a disk fail you loose everything
- in fact you could rely only on backup but in this case you have to be really sure your restore will work if you need it, so you really have to test the restore

Hope this help.
David Johnson, CD, MVPOwnerCommented:
A backup that is not tested in a restore scenario is a waste of processor time and disk space. The last thing you need to find out is that the backup is corrupt and you cannot restore.. This can actually cause the business to fail as well.

As I stated previously PAGEFILES are a required item.. the operating system is designed to use them.

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