Disk array write protection at the sub-unit level

Details Disk array write protection at the sub-unit level Disk array write protection at the sub-unit level

1997-03-31

1999-04-13

Chung, Phung M.

Excavating

371 48, G06F 1110, H03M 1300

Patent

active

058944850

ABSTRACT:
A method and apparatus, operating in a system having a plurality of host computers and memory system having a disk controller with at least one mass storage device having a plurality of logical volumes, provide for write protecting the logical volumes. The method features writing, in response to a first host, a write protect message to a memory associated with the controller channel directors; polling, from each channel director, the memory for new write protect messages; and preventing, at, for example, the channel director level, a host connected to the channel director from writing to a protected logical volume which is the subject of the write protect message. The write protect status of that channel director, for that logical volume, remains in effect until the write protect condition for that volume has been reset.

REFERENCES:
patent: 4606016 (1986-08-01), Verboom et al.

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