Eco Mode based on MAID (Massive Arrays of Idle Disks) can be configured for ETERNUS Disk storage systems.
Performing either of the following controls during a period of time of not accessing disk drives can reduce power consumption, leading to the reduction of loads on environments.
Spindle rotation control of disk drives
Power control of disk drives
The above "b" is recommended. It can reduce power consumption more effectively than the above "a".
The devices that support "b" are shown in "Table 1.2 Devices That Support Power Control of Disk Drives".
Storage Device Name | Firmware Version |
|---|---|
ETERNUS DX100 S3/DX200 S3 | V10L20 or later |
In this software, the following functionality is provided for ETERNUS Disk storage systems.
Note
This function cannot be used for ETERNUS DX200F.
The Eco-mode can be controlled via the Web Console or by executing the storageadm command in the Management Server.
See
Refer to "6.1.6 How to Control Eco-mode" for details.
Of the disk drives mounted on ETERNUS Disk storage systems, the following disk drive count is displayed as the number of active disks:
Eco Mode Set to RAID Group to Which Disk Drives Belong | Number of Active Disks |
|---|---|
Spindle rotation control of disk drives | Number of disk drives whose spindle is rotating |
Power control of disk drives | Number of powered disk drives |
Eco-mode unset | Number of powered disk drives (*1) |
*1: The following ETERNUS Disk storage systems display the number of disk drives whose spindle is rotating as the "number of active disks":
Storage Device Name | Firmware Version |
|---|---|
ETERNUS DX60/DX60 S2 | All versions |
ETERNUS DX100 S3/DX200 S3 | Less than V10L20 |
By using the performance information for the number of active disks, the effects of energy-saving operations can be easily verified.
See
The amount of power used by an ETERNUS Disk storage system device as a whole is displayed as "Power consumption".
The peripheral temperature (fan intake temperature) of an ETERNUS Disk storage system is displayed as "Temperature".
By using the performance information for power consumption, the effects of energy-saving operations can be easily verified.
By using the performance information for temperature, the air-conditioning effects at the device periphery can be easily verified.
See
Concerns in Storage System Operation When Using Eco-mode
There are following concerns when using Eco-mode in storage system operation.
The Eco-mode can be controlled for each RAID group. Therefore, when different transactions (type, online time, etc.) use a RAID group, the disk drives of its RAID group may not be able to be stopped depending on the operating policy of the transaction. Consider the relation between RAID group and transactions in the design of the storage system operation using Eco-mode.
The Eco-mode is not available for the following RAID groups.
A RAID group for which the system disk is included
A RAID group for which it is set in the NAS area
A RAID group for which the mainframe volumes, MVV volumes or MVV Concatenation volumes are registered
A RAID group for which no volumes are registered
A RAID group that includes an SSD
A RAID group used by Thin Provisioning function
A RAID group used by Flexible Tier
A RAID group belonging to a REC disk buffer
Temporary RAID group created while executing the Logical Device Expansion
The ETERNUS Disk storage system stops a disk drive after confirming that its disk drive is not accessed within a certain period of time (30 minutes). Therefore, time more than its period is needed until the disk drive stops actually even if the "stop request" in this software is executed.
The ETERNUS Disk storage system does not stop a disk drive while the configuration of the RAID group or volume is changed and the Advanced Copy to access to its disk drive is done. Therefore, the disk drives may not be stopped even if the "stop request" in this software is executed. The disk drives will stop when the procedure is completed in the ETERNUS Disk storage system.
When it is accessed to the stopped disk drive, the ETERNUS Disk storage system starts its disk drive rotation. However, a few minutes (about thee minutes) is needed until the disk drive becomes the accessible status.
When the number of the starting disk drive rotation exceeds the number of certain times (three times), the ETERNUS Disk storage system judges that its disk drive is used with high frequency and does not stop its disk drive rotation. Therefore, even if the "stop request" in this software is executed, after the disk drive status changes from "Idle" to "Active" and there is no access to its disk drive, its disk drive status may not change to "Idle".
The number of the starting disk drive rotation per one day is cleared to zero when time of ETERNUS Disk storage system becomes 00:00.
