Eco-Mode - Fujitsu Eternus DX80 S2 User Manual

Chapter 3 Setup

3.3 Eco-mode

3.3 Eco-mode
Eco-mode is a function that is specifically designed to reduce the power consumption that is
characteristic of Massive Arrays of Idle Disks (MAID).
Eco-mode saves power by managing the scheduled operation times of specified disks and stop-
ping the motors of disks during periods when they are not required.
The scheduled operation times can be set for each RAID group or TPP and for operations such
as backing up.
If an access occurs while a motor is stopped, the disk is immediately spun up and access
proceeds normally after approximately one minute.
The disk motors can be turned on and off as required by linking the following Storage Foundation
Software ETERNUS SF to Eco-mode.
• ETERNUS SF Storage Cruiser
• ETERNUS SF AdvancedCopy Manager
The following hierarchical storage management software can be also linked with Eco-mode.
When using the Eco-mode function with these software, an Eco-mode disk operating schedule
does not need to be set, since these software turns on the disk motors when stopped disks are
accessed.
• IBM Tivoli Storage Manager for Space Management, Tivoli Storage Manager HSM for
Windows
• Dynamic Storage Tiering (DST) function in Symantec Veritas Storage Foundation
The restrictions and notes on using Eco-mode are described below. For details on the Eco-mode
procedure, refer to "ETERNUS Web GUI User's Guide" or "ETERNUS CLI User's Guide".
• To set Eco-mode, use ETERNUS Web GUI, ETERNUS SF Storage Cruiser, or ETERNUS SF
AdvancedCopy Manager (hereinafter, referred to as Storage Foundation Software ETERNUS
SF). Use ETERNUS Web GUI to set Eco-mode for TPPs. Storage Foundation Software
ETERNUS SF cannot set Eco-mode for TPPs.
• Eco-mode cannot be used for the following drives:
-
-
• Disk motors in the following RAID groups are not stopped by the Eco-mode schedule:
-
-
• The operation time of disks varies depending on the Eco-mode schedule and the disk access.
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ETERNUS DX80 S2/DX90 S2 Disk storage system User's Guide -Operation-
Hot spares
SSDs
RAID groups in which no volumes are registered
RAID groups in which SDPVs are registered
When an Eco-schedule is set, the motor of a disk is turned on 10 minutes before the
scheduled operation time period starts.
When no access occurs for the time interval that is set in the motor-off interval setting of
the Eco-mode general setting function of ETERNUS Web GUI or ETERNUS CLI before
the scheduled operation time period finishes, the motor of a disk is turned off 10 minutes
after the scheduled operation time period finishes. When an access occurs within the
motor-off time interval before the scheduled operation time period finishes, the disk motor
of the last disk that was accessed remains turned on for the time interval that is set in the
"Host I/O Monitoring Interval".
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