Allocating space in ESX or Hyper-V machines.

In VMware Workstation, if I make a new machine, I can set disk space to be 100 GB for a (say) Windows 7 machine. It uses 50 GB and the remaining space is NOT allocated (I do not pre-allocate) but within the 100 GB limit, I can use space as I need. I like this approach.

For VMware ESX or for Hyper-V, if I make a new machine, is my space allotment pre-allocated? or not pre-allocated?  Is there an option?

Thank you for your help.
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JohnBusiness Consultant (Owner)Asked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
is my space allotment pre-allocated? or not pre-allocated?  

ESXi - you have a choice of Thick (which is similar to pre allocated), or Thin, which expands to the size of defined virtual disk.

Hyper-V - similar choice, of either Fixed or Dynamic, and follow the same above.

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JohnBusiness Consultant (Owner)Author Commented:
Thank you Andrew.   That helps.  I like to allocate lots of space because I see here (frequently):  "I made a small machine and I am running out of space"  So the above helps a great deal.
JohnBusiness Consultant (Owner)Author Commented:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
It's always better to create a small disk, and expand it (supported and easy), because over allocating and creating a large disk, and using up all the storage is more difficult to resolve!
JohnBusiness Consultant (Owner)Author Commented:
Yes, I agree. I recommended that in another thread I was answering and another expert said it was Overkill. If the space is not used, then I do not think it is overkill.

Thanks again.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
there is another issue with hosts datastores (it's not good admin if you allocate all the datastores to virtual machine disks)  because space is required for the SWAP file (just like workstation), and Snapshots as well, so host datastores should be left 20-30% free!!
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