Apparatus and method for changing the cache mode dynamically in

Details Apparatus and method for changing the cache mode dynamically in Apparatus and method for changing the cache mode dynamically in

1995-11-14

1998-09-29

Beausoliel, Jr., Robert W.

G06F 1100

Patent

active

058156488

ABSTRACT:
A method for changing the cache mode of a volume in response to user commands or detection of a failure within the storage system. Specifically, the method applies the new cache mode to all newly issued I/O requests, while retaining the old cache mode for previously unfinished or queued I/O requests. The method incorporates a cache mode field to the I/O request data structure. The cache mode field specifies the cache mode to be used for that I/O request. The method initializes the I/O request cache mode field with the value of the cache mode field of the corresponding target volume. When the cache mode of a volume is changed, all subsequent I/O requests to the volume are tagged with the new cache mode in their cache mode field. However, previous I/0 requests will retain the former cache mode and will be completed using the former cache mode.

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