Appeal No. 96-0028
Application 07/885,099
1-10 and 15-19, which constitute all the claims remaining in
the application.
Claim 1 reads as follows:
1. A method of providing rotational position
sensing miss avoidance for data transfer operations between a
plurality of computer systems connected to a controller and a
plurality of direct access data storage devices which utilize
count-key-data field format connected to the controller,
wherein the controller includes a plurality of signal paths
for completing channel paths between a computer system and a
direct access storage device, the method comprising the steps
of:
generating a request from a computer system for a
data transfer operation for a direct access storage device;
responsive to a device sector ready interrupt from
the direct access storage device, determining if a data
transfer operation pending on the direct access storage device
is a miss avoidance candidate;
responsive to determination that said data transfer
operation pending is a miss avoidance candidate, granting a
miss avoidance lock to the direct access storage device for a
signal path;
upon the device sector ready interrupt dropping and
the request from the computer system ageing beyond a
predetermined threshold, staging data from the direct access
storage device into a controller cache; and
upon reaching a track index on the direct access
data storage device, discontinuing staging of data from the
direct access storage device, releasing the miss avoidance
lock to the direct access storage device, and treating the
request from the computer system as a cache hit.
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Last modified: November 3, 2007