Should I format used 3TB drive in Solaris 11.1?

[grandtouringi]

Background: I'm re-using a 3TB drive from an existing system in my Solaris 11.1 NAS. I used GPARTED to remove all the partitions and left the all the drive space as unallocated. In the past I have always used new drives so I never bothered to format them in Solaris, just created a zpool without issues.

Three questions:

1. Is it necessary to re-format the drive in Solaris or should I just create another zpool with the entirety of the drive being "unallocated"? (When I check the available disks it shows as formatted...)​

2. I started the format process tonight, approximately how long will it take to format 3TB?​

3. Are there any special considerations I need to take into account using a 3TB drive in Solaris 11.1?​

AVAILABLE DISK SELECTIONS:
0. c0t5000C5004F7E3D85d0 <ATA-ST3000DM001-1CH1-CC24-2.73TB>
/scsi_vhci/disk@g5000c5004f7e3d85
Specify disk (enter its number): 0
selecting c0t5000C5004F7E3D85d0
[disk formatted]

format> format
The protection information is not enabled
The disk will be formatted with protection type 0
Mode sense page(4) reports rpm value as 0, adjusting it to 3600
Ready to format. Formatting cannot be interrupted.
Continue? y
Beginning format. The current time is Mon Feb 10 18:58:25 2014

Formatting...
Mode sense page(4) reports rpm value as 0, adjusting it to 3600
Mode sense page(4) reports rpm value as 0, adjusting it to 3600


Thanks in advance for your help!