Apparatus for suspending a reserve operation in a disk drive

Details Apparatus for suspending a reserve operation in a disk drive Apparatus for suspending a reserve operation in a disk drive

G - Physics

06

F

352/21

G06F 3/06 (2006.01) G11B 5/09 (2006.01) G11B 19/02 (2006.01)

Patent

CA 1215776

ABSTRACT Apparatus in a disk drive connected by separate buses to two controllers for suspending the effect of a reserve instruction received from one controller when the other controller has already reserved the disk drive until the other controller releases the disk drive. The apparatus corresponding to each controller consists or suspended reserve logic and a register for retaining state indicating whether the controller has reserved the bus and state indica- ting whether the reserve operation has been suspended for the controller. The suspended reserve logic for a given control- ler receives inputs from the controller's bus, from the state stored in its register, and from the state in the suspended reserve apparatus for the other controller indicating whether that controller has reserved the disk drive. Outputs from the suspended reserve logic go to its register. If the suspended reserve logic receives a reserve instruction when the state received from the other suspended reserve apparatus indicates that the other controller has reserved the disk drive, the suspended reserve logic sets the state indicating that the reserve operation has been suspended. When the other controller provides a release instruction and thereby resets the state indicating that the other controller has reserved the disk drive in the register in its suspended reserve logic, the suspended reserve logic for the controller sets the state indicating that the corresponding controller has reserved the disk and resets the state indicating that the reserve operation is suspended. -2-

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