SCSI disk drive power down apparatus

Details SCSI disk drive power down apparatus SCSI disk drive power down apparatus

1994-01-28

1996-07-09

Harvey, Jack B.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 32, G06F 1300

Patent

active

055354009

ABSTRACT:
An SCSI controller having a mechanism for receiving a power down request indicating that the SCSI disk drives should be spun down. Preferably, the SCSI controller has an input for receiving a power down request signal. The SCSI controller monitors activity on the SCSI bus and asserts a signal indicative thereof to power management logic. The power management logic monitors the resources of the computer system and generates a system interrupt and the power down signal to initiate a power down mode when the computer system is determined to be idle. The CPU receives the system interrupt to perform traditional power down sequences. The SCSI controller receives the power down signal and generates a SCSI interrupt. The CPU also receives the SCSI interrupt and executes an SCSI device driver. The SCSI device driver determines that power down mode is being initiated, and sends spin down request commands to the SCSI controller for each SCSI drive. The SCSI controller powers down each of the SCSI devices in response. Any subsequent activity requiring access to any SCSI drive is detected by interrupt calls to the SCSI device driver, which then sends spin up requests to the SCSI controller, if necessary.

REFERENCES:
patent: 4802152 (1989-01-01), Markvoort et al.
patent: 5167024 (1992-11-01), Smith et al.
patent: 5181201 (1993-01-01), Schauss et al.
patent: 5339426 (1994-08-01), Aoshima
patent: 5355453 (1994-10-01), Row et al.
patent: 5361364 (1994-11-01), Nagashige et al.

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