This came up from a question on a forum that should be on about page 1 of the Exchange Server deployment guide but seemingly it isn’t known by everyone.
Disks – these are the physical drives within the server. The more you have the faster things will run – by and large.
Volumes – these are logical drives that sit on disks. You can cut the disks up as you wish into volumes.
Can you see a “BUT” here?
If you have one disk and put 3 volumes onto it – C, E and F (D is the DVD drive here) then accessing C for the operating system, E for the Exchange application install and F for the Exchange database means that the disk head has to do a huge amount of moving which will actually slow things down.
Rule of thumb – one volume per disk. Increase the disks not the volumes.
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