Some SAN vendors advise using a centralized Swap datastore to separate the type of traffic on the volume. Things like deduplication are not good with swap data. Also the swap files could then be placed on high performing SSD, while leaving the vmdk's on SAS or FC.
As for worrying about contention on that single datastore, you still need to think about it. In my mind, if you are swapping, performance is very bad anyway. So disk contention on top of that is making a bad situation worse, but either case is not acceptable. We are looking at centralizing all swap files, for IO patterns on the SAN. And we are looking at putting the swap files for 100+ VM's on the same volume.
Also this goes for the page file within the Windows VM. This is a larger task. We are looking at moving the page files to a different volume as well.
Charles Killmer, VCP
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Charles Killmer, VCP4
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