December 2002
Intermediate to advanced
260 pages
9h 18m
English
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Controller Disk Spin-up
Before a disk can be accessed, it must be spinning at its nominal RPM. This process usually takes only a few seconds and occurs automatically when power is applied to the system. On systems with a lot of SCSI disks, it is useful to defer spin-up until each I/O channel is scanned. This helps underpowered systems with many disks because disks draw additional power during the spin-up process. ATA disks spin up automatically and offer no user control over their startup behavior.
While SCSI controllers can spin up disks, many drives ship with power-on spin-up enabled. That means the disk will spin up as soon as power is applied. If you want to use the controller’s deferred spin-up features, you need to enable controller spin-up on individual disks, which is usually accomplished by installing or removing a jumper on each drive. Consult your hard disk manuals for further details.
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