One large VMDK file or smaller ones

Now with esxi 5.5, we can have 64 TB vmdk files, but is there a performance benefit of having multiple vmdk's in multiple datastores, or just having one large vmdk?  I could see the benefit for a large number of vmdk's and VM's, but if it's just for backup purposes using MS DPM, is there any reason I should consider one over the other?  Thanks.
SSEHelpDeskAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
If you have the luxury of tiered storage, and different SANs/Volumes/LUNs, offering SAS, SATA and SSD, different RAID types using multiple datastores, then having different VMDKs on different datastore technologies you will see a performance benefit, because of the differing datastore characteristics.

If these are single VMDKs, but are you referring to have multiple 2TB VMDKs to make up a 64TB VMDK spanned internally in the OS?

For simplicity I would use a single large VMDK if you need a super sized virtual disk for your VM.

BUT, we use multiple disks, and datastores for resilience, just in case a LUN or store gets corrupted.

A supersize LUN/datastore or virtual disk, all your eggs in one basket!
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
VMware

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.