Snapshots

Office Arguments – Maximum VMDK size is NOT 2TB-512bytes

…if you want to use snapshots Pop Quiz Q: What’s the maximum size VMDK you could create in vSphere 5.1 or earlier? A: Most people that have studied for VCP will know the maximum VMDK size is 2TB minus 512 bytes. If you create a disk in the GUI, it allows you to choose 2TB, but it’s smart enough to minus 512 bytes. So technically that’s the maximum VMDK size, but you should NOT create it that big.

Maximum Disks Per SCSI Controller is NOT 15

 Pop Quiz Q: What’s the maximum number of disks per SCSI Controller? A: It depends.. On your VCP exam, you would have said 15. Correct. Although if you want to clone or snapshot and quiesce a VM, the maximum is 7 disks per SCSI controller. Each SCSI Controller can control 15 disks and the quiesced snapshots in Windows 2008 require one available slot per existing disk. If you have more than 7 disks, the clone / quiesce part will fail, and you’ll have the following errors in vCenter and the VM’s vmware.