Hello mrslyfox,

Here is what is stated on page 91 of the Administrator guide under disk group & virtual disk expansion.

“Adding free capacity to a disk group is achieved by adding unconfigured capacity on the array to the disk group. Data is accessible on disk groups, virtual disks, and physical disks throughout the entire modification operation. The additional free capacity can then be used to perform a virtual disk expansion on a standard or snapshot repository virtual disk.”

http://topics-cdn.dell.com/pdf/powervault-md3400_administrator-guide_en-us.pdf

Please let us know if you have any other questions.

Hello @DELL-Sam L

But what about virtual disk capacity extension, is it safe to do that during normal operational time?

we have defined mapping for one virtual disk with esxi 6.0u2

Hello mrslyfox,

Both Disk group expansion & Virtual disk Expansion are low priority task that can be done while the virtual disk is in production.

Please let us know if you have any other questions.