NEC M310 - Storage System Information Retention Function; Storage System Information Retention Function Overview; Replication Reserved Volume Comparison

(3) The Number of Hot Spare Disk Drive
• There is no upper limit for the number of hot spare disks.
• Bind hot spare disks when NL-SAS disk drives are in the system.
• Refer to the table below for the recommended numbers of hot spare disks for each type of disk
drive.
Recommended number of hot spare disk drives
Disk drive type Condition Recommendation
SAS Disk Drive
One type of capacity/rotation speed One hot spare drive / 24 disk drives
n types of capacity/rotation speed n spare disk drives / 24 disk drives
NL-SAS Disk Drive
*1
One type of capacity/rotation speed One hot spare drive / 12 disk drives
n types of capacity/rotation speed n spare disk drives / 12 disk drives
SAS SSD
Hot spare is optional. Because SAS SSD does not have mechanical parts
such as motors, heads and media, it is reliable. Therefore, hot spare is not
necessary.
5. Functions <Hot Spare Disk (3)>
*1
Must assign hot spare disks when NL-SAS disk drives are in the system.
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