It's better if you can buy another same size same type drive. Then create new Virtual Disk Group. Then you need to add this new VDG to Pool A as per procedure below,
To add a disk group
1. In the Pools topic, select Action > Add Disk Group.
The Add Disk Group panel opens.
2. Set the options.
3. If you are creating a linear disk group, select the RAID [number] or SPARE option to determine if you will be selecting
disks for the RAID configuration or as dedicated spares for the disk group.
4. Select the disks.
5. Click Add.
If your disk group contains a mix of 512n and 512e disks, a dialog box displays. Perform one of the following:
To create the disk group, click Yes.
To cancel the request, click No.
If the task succeeds, the new disk group appears in the Related Disk Groups table in the Pools topic when you select
the pool for it in the pools table.
Hope this helps!
Regards
Subhajit
I am an HPE employee
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