Environmental Burden Reduction; Eco-Mode; Figure 41 Eco-Mode - Fujitsu ETERNUS DX100 S4 Design Manual

2. Basic Functions

Environmental Burden Reduction

Environmental Burden Reduction

Eco-mode

Eco-mode is a function that reduces power consumption for limited access disks by stopping the
disks rotation during specified periods or by powering off the disks.
Disk spin-up and spin-down schedules can be set for each RAID group or TPP. These schedules can
also be set to allow backup operations.

Figure 41 Eco-mode

Working Phase
12
Off
PM
(12:00 to 24:00)
SAS disk
Nearline SAS disk
Disks stopped
The Eco-mode of the ETERNUS DX is a function specialized for reducing power consumption at-
tributed to Massive Arrays of Idle Disks (MAID). The operational state for stopping a disk can be se-
lected from two modes: "stop motor" or "turn off drive power".
The disks to be controlled are SAS disks and Nearline SAS disks.
Eco-mode cannot be used for the following drives:
Global Hot Spares (Dedicated Hot Spares are possible)
•
SSDs
•
• Unused drives (that are not used by RAID groups)
The Eco-mode schedule cannot be specified for the following RAID groups or pools:
• No volumes are registered
Configured with SSDs
•
RAID groups to which the volume with Storage Migration path belongs
•
• RAID groups that are registered as an REC Disk Buffer
• TPPs where the Deduplication/Compression function is enabled
FTSP
•
FTRP
•
Fujitsu Storage ETERNUS DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems Design Guide (Basic)
Disk
Backup Phase
spin-up
Off
(0:00 to 5:00)
SAS disk
Backup
Nearline SAS disk
Disks spinning
Control linked to usage
Backup disks spins
for five hours
75
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Disk
spin-down
12
On
5
AM
Working Phase
12
Off
AM
(5:00 to 12:00)
SAS disk
Nearline SAS disk
Disks stopped
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