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This invention relates to a method for accessing multiple DASD tracks utilizing a new channel command (NCC).
English (United States)
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Method for Accessing Multiple Dasd Tracks
This invention relates to a method for accessing multiple DASD tracks
utilizing a new channel command (NCC). The method comprises the steps of: (a)setting the NCC count field equal to the maximum number of bytes that can be
written to a track plus a predetermined number of bytes equal to the length of an
appended end-of- track data field; (b)setting the NCC flag byte to suppress error
indication on invalid length of data on the track; (c)operating a storage controller
to (1)initially orient to the home address of a track to be read; (2)transfer the data
on the track; (3)transfer an appended field; (4)repeating steps 1-3 for each track
to be used; and (d)operating a central processor to (5)writing the data from a
track and its appended field into a buffer; (6)determining the length of data read
from that track from the location of the appended field within said buffer; and (7)repeating steps 5 and 6 for each buffer.
The above method advantageously orients on the home address of the first
track to be read and additionally orients on any count field of the track for DASD
error recovery procedures. After orientation data is transferred, all subsequent
data transfers start with record 0. Upon encountering a defective track, an
alternate track is located, pointed to by the primary with transfers of data being
made from the alternate track.