Proware Fibre to SAS/SATA RAID Subsystem, Руководство пользователя

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Fibre to SAS/SATA RAID Subsystem
90 User Manual
5.5.3 HDD Power Management
MAID (Massive Array of Idle Disks) is a storage technology that employs a large group
of disk drives in which only those drives in active use are spinning at any given time.
This reduces power consumption
and prolongs the lives of the drives.
MAID is designed for Write Once, Read Occasionally (WORO) applications such as Data
Backup, Document, Mail server, and so on.
MAID technology focuses on "Green Storage Concept" to save power consumption and
enhance disk drives effective usage, i.e., "disk drives are spun down when there is no
activity or I/O on the drives".
In the Disk Array, MAID is implemented in the HDD Power Management menu. Using
the Advanced Power Management (APM) function of disk drives, HDD Power
Management has three options (MAID Levels): (Level 1) Place idle drives in Lower Power
Mode, where the drives’ heads are unloaded; (Level 2) Place idle drives in Low RPM
Mode, where drives’ heads are unloaded and slows down to around 4000 RPM; and
(Level 3) Spin down idle drives, where drives stops spinning and goes into sleep mode.
Stagger Power On Control:
This option allows the Disk Array’s power supply to power up in succession each
HDD in the Disk Array. In the past, all the HDDs on the Disk Array are powered up
altogether at the same time. This function allows the power transfer time (lag
time) from the last HDD to the next one be set within the range of 0.4 to 6.0 seconds.
Default is 0.7 seconds.