Disk drive synchronization

Details Disk drive synchronization Disk drive synchronization

1997-09-22

2000-09-12

Loomis, Paul

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 69, 360 71, G11B 1552

Patent

active

061186120

ABSTRACT:
A spindle synchronization technique is described which is useful in a disk array subsystem comprising a plurality of disk drives (40,41,42,43) connected by means of serial links (25,26,27,28) to a disk drive controller (20). Data and command information is transmitted over the link in the form of multi-character frames, the flow of which is regulated by special ten bit protocol characters. A SYNC protocol character is defined which is used to synchronize the spindles of the disk drives. This SYNC character is issued by controller to selected ones of the drives over the same link used for the transmission of the command and data information. The SYNC character may be interleaved between the characters of frames being transmitted over the link.

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Patterson et al., "A Case for Redundant Arrays of Inexpensive Disks (RAID)", ACM SIGMOD Conference, Chicago, Illinois, Jun. 1-3, 1988.

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