Method for performing on-line reconfiguration of a disk array co

Details Method for performing on-line reconfiguration of a disk array co Method for performing on-line reconfiguration of a disk array co

1995-06-07

1996-11-12

Shah, Alpesh M.

Boots, shoes, and leggings

395404, 395492, 36424231, 364243, 364245, 3642633, 3642683, 364DIG1, G06F 1100, G06F 1200

Patent

active

055748511

ABSTRACT:
An architecture for on-line reconfiguration on a RAID level 0, 1, 2, 3, 4 or 5 disk array. This architecture allows the computer system to perform reconfiguration of the disk array transparently, with disk I/O operations being performed concurrently with reconfiguration operations. The reconfiguration process allocates computer system resources necessary to support both the old and new array configurations during the reconfiguration process. Logical areas within the array are sequentially reconfigured from the old configuration to the new configuration. Data in each logical area is read from the area undergoing reconfiguration and thereafter overwritten in accordance with the new array configuration. System I/O requests received during reconfiguration which are directed to unreconfigured areas in the disk array are executed in accordance with the old array configuration. System I/O requests received during reconfiguration which are directed to reconfigured areas in the disk array are executed in accordance with the new array configuration.

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