A customer requires 60 TB of storage space available on an OceanStor V3 storage system to store service data. How many disks will be used if the customer installs 600 GB 15K RPM SAS disks and creates a pool with RAID 5 (8D+1P) using a low hot spare policy? (Select the closest number without considering the required data protection space.)

Question

Quizplus · Accepted Answer

To calculate the number of disks needed, first determine the usable capacity per RAID 5 group: 8 disks x 600 GB = 4800 GB (4.8 TB). To achieve 60 TB, divide 60 TB by 4.8 TB, resulting in approximately 12.5 RAID groups. Since you can't have a fraction of a RAID group, round up to 13 groups. Each group requires 9 disks (8 data + 1 parity), so 13 groups x 9 disks = 117 disks. Adding a few extra disks for hot spares, the closest choice is 140 disks.

A Customer Requires 60 TB of Storage Space Available on an OceanStor