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 40 Eco-mode
SAS disk
Nearline SAS disk
SAS disk
Nearline SAS disk
SAS disk
Nearline SAS disk
Disks spinning
Disks stoppedDisks stopped
Contr
ol linked to usage
Working Phase
Disk spin-up Disk spin-down
Backup Phase
Backup
AM
(0:00 to 5:00)
5
PM
(12:00 to 24:00)
12
Off
12
OffOff
12
On
AM
(5:00 to 12:00)
Working Phase
The Eco-mode function of the ETERNUS DX is specialized for reducing power consumption attributed to Massive
Arrays of Idle Disks (MAID). The operational state for stopping a disk can be selected 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
2. Basic Functions
Environmental Burden Reduction
93 Design Guide
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