Types of Drives
If a combination of NVMe SSDs, SAS SSDs, SAS disks, Nearline SAS disks, and SEDs is installed in the ETERNUS DX, each different type of drive requires a corresponding hot spare.
Caution
The hot spare with the same drive type with a failed disk drive may not be used since the installed position of the hot spare is given higher priority than the drive type of the hot spare, and SAS disks and Nearline SAS disks can be substituted.
If different drive types are mixed, the recommended action is to install a hot spare for each different drive type on each path. Refer to Selection Criteria for more details.
The capacity of each hot spare must be greater than or equal to the largest capacity of the same-type drives.