Boots – shoes – and leggings
Patent
1981-12-28
1984-03-06
Zache, Raulfe B.
Boots, shoes, and leggings
G06F 300
Patent
active
044357559
ABSTRACT:
For a CPU I/O request, the disclosed methods find a physical channel path within a logical channel (LCH) likely to be connectable to a requested device by using channel path count (CAT count) fields. The CAT counts respectively indicate the current number of uncompleted requests accepted by the respective physical channels in the data processing system. An available physical channel in the LCH with the smallest CAT count is found as the candidate channel path for a connection attempt to the requested device. If the lowest CAT count is equal for plural available channel paths, any of these plural channel paths may be selected as the candidate channel path. The CAT count for a channel path is incremented for each successful connection of any device to that channel path. The CAT count for a channel path is decremented upon receiving a signal indicating that a successfully connected I/O device has completed the operation for a request. CAT counts indicate the current load on each physical channel across all LCHs in which the physical channels may be contained. The CAT counts indicate the relative likelihood of the physical channels within a LCH being non-busy relative to each other in order to find the channel path most likely to be non-busy and thereby avoid a RPS miss when a requested DASD record is reached during disk rotation. Choosing the channel paths with the lowest available CAT counts balances the load among the physical channels across all LCHs containing the same physical channel.
REFERENCES:
patent: 3810105 (1974-05-01), England
Goldman Bernard M.
International Business Machines - Corporation
Zache Raulfe B.
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