Specifications

142 en | Host-side and Drive-side Parameters SCSI to SATA RAID Subsystem | Administrator’s Manual
F.01U.027.802 | V1 | 2006.11 Bosch Security Systems
8.2.4 Drive Spindown Idle Delay Period
Fig. 8.15 Selecting Drive Spindown Idle Delay Period
This is power saving feature which allows hard drive motor to spin down after a configurable
period of time with no I/O requests directed to the hard drives.
The drive spin down command is designed for usage on disk-to-disk (D2D) backup system. In
normal case, the RAID system serves as I/O interface between hosts and drives. On disk-to-
disk (D2D) backup system, the I/Os only occur when the backup command is valid. Without
backup requirements, the spin down command can make drives enter an idle state hence
reduce the power consumption of drives.
User can setup an idle period for the drives. Drives will automatically spin down while there is
no read/write command to drives within the idle period. Then if any I/O command is issued,
such as disk backup, the drives will wake up and serve the I/O requirement.
Choose “Drive Spindown Idle Delay Period,” then press [ENTER]. A list of selections will
appear. Move the cursor bar to a selection, then press [ENTER]. Choose Yes in the dialog box
that follows to confirm the setting.
8.2.5 Drive Delayed Write
Fig. 8.16 Enabling/Disabling Delayed Write
This option allows utilizing the cache buffer embedded with disk drives. Note that if power
outage or hard drive failure occur with data still kept within the disk buffer, data inconsistency
might occur.