A customer has purchased a 4-node N8500 clustered NAS storage system. The enterprise-edition engine nodes have two CPUs, 10GE network ports, and 48 GB cache. The performance of an engine node reaches 700 MB/s. The back-end storage uses the S5600T, which is configured with 80 SAS disks divided into eight 9-disk RAID 5 groups. Each RAID group has one hot spare disk. The performance of each SAS disk in the 9-disk RAID 5 groups is 30 MB/s. According to the preceding information, what is the overall performance of the N8500 without considering other factors?

Question

Quizplus · Accepted Answer

The overall performance is determined by the backend storage performance. Each RAID 5 group has 8 active disks (9 disks minus 1 for parity), and each disk provides 30 MB/s. Thus, each RAID group provides 240 MB/s (8 disks x 30 MB/s). With 8 RAID groups, the total performance is 1920 MB/s (8 groups x 240 MB/s).

A Customer Has Purchased a 4-Node N8500 Clustered NAS Storage