You work as a design specialist at Certkiller .com. You back up a database from clones on a dedicated media server. The media server is connected to an array via six HBAs through two fabrics without ISLs to six Fas with a 1:1 fan out ratio. The backup is multi-threaded to eight LTO II tape drives attached to an independent fabric. Statistics show the backup time=recovery time=8 hours at a host transfer rate of 360 GB/hour.
What would be your best achievable backup/recovery time?

A.
Tape SAN HBAs = 1, Backup =2.00 hours, Tape Recovery = 3:00 hours

B.
Tape SAN HBAs = 1, Backup =4.00 hours, Tape Recovery = 2:40 hours

C.
Tape SAN HBAs = 2, Backup =2.00 hours, Tape Recovery = 3:00 hours

D.
Tape SAN HBAs = 2, Backup =4.00 hours, Tape Recovery = 2:40 hours

E.
Tape SAN HBAs = 3, Backup =2.00 hours, Tape Recovery = 3:00 hours

Explanation:
The total data to backup is 360×8=2880GB. Recovery can be parallel across all 8 tapes at 144GB/hour per tape. So the recovery window will be 2:40 hours. Balancing across 2 HBA’s for backup should cut window in 1/2 so 4:00.