Fujitsu Eternus DX60 S2 User Manual page 43

Chapter 3 Setup
3.2 Eco-mode
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 operation 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).
• Eco-mode cannot be used for the following disks:
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• Disk motors in the following RAID groups are not stopped by the Eco-mode schedule:
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• The operation time of disks varies depending on the Eco-mode schedule and the disk access.
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ETERNUS DX60 S2 Disk storage system User's Guide -Operation-
System disks
Hot spares
RAID groups that contain a system disk
RAID groups in which no volumes are registered
RAID groups in which SDPVs are registered
When an Eco-mode schedule is set, the motor of a disk is turned on 30 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 30 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".
Access to a stopped disk outside of the scheduled operation time period causes the motor
of the stopped disk to be spun up, allowing normal access in about one to three minute.
When a set time elapses since the last access to a disk, the motor of the disk is stopped.
The time to stop the motor of the disk is the time that is set in the "Host I/O Monitoring
Interval" of the Eco-mode general setting function of ETERNUS Web GUI or ETERNUS
CLI. The default setting is 30 minutes.
If a disk is activated from the stopped state more than a set amount of times in a day, the
Eco-mode schedule is not applied and disk motors are not stopped by the Eco-mode. The
number of disk activations from a stopped state can be set in the "Disk Motor Spin-down
Limit Count" of the Eco-mode general setting of ETERNUS Web GUI or ETERNUS CLI.
The default setting is 3 times.
Copyright 2011 FUJITSU LIMITED
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