ibm:vm370-lib:cp:dmkdas.assemble_abs
Table of Contents
DMKDAS Abstract
Statistics
Type ASSEMBLE
Source Lines : 1,474
Fixes Applied : 13
Most Recent Version : Thursday, December 7, 1978
Last Fix ID : [HRC202DK]
Synopsis
Function
WHILE EXECUTING A CP GENERATED DASD CHANNEL PROGRAM. THE ORIGINAL CHANNEL PROGRAM WILL BE RETRIED WHEN POSSIBLE TO CORRECT THE FAILING CONDITION. IF THE ERROR CONDITION IS UNCORRECTABLE CONTROL WILL BE PASSED TO THE MESSAGE WRITER (DMKMSW) FOR OPERATOR AWARENESS. UPON RETURNING FROM MESSAGE WRITER THE ORIGINAL CHANNEL PROGRAM MAY BE RE-EXECUTED OR TERMINATED. ALSO STATISTICAL COUNTERS FOR 2314 TYPE DEVICE WILL BE UPDATED.
Operation
THE ADDRESS OF THE IOERBLOK IN THE RDEVBLOK. B. TEST FOR CHANNEL ERRORS. 1. CHANNEL DATA CHECKS ARE RETRIED 10 TIMES. 2. INTERFACE AND CHANNEL CONTROL CHECKS ARE RETRIED 10 TIMES. C. TEST FOR THE SPECIFIC TYPE OF ERROR. 1. EQUIPMENT CHECK - THE OPERATION IS RETRIED 10 TIMES 2. NO RECORD FOUND (NRF) CONDITION (2314/2319) A READ HOME ADDRESS IS EXECUTED AND THE DATA IS COMPARED TO THE SEEK ADDRESS. IF THE COMPARISON IS UNEQUAL A RECALIBRATE IS EXECUTED AND THE ORIGINAL CHANNEL PROGRAM IS RETRIED FOR A MAXIMUM OF 10 TIMES. IF THE COMPARISON IS EQUAL RETURN TO THE CALLER. NO RECORD FOUND CONDITION (2305/3330/3340) RETURN TO CALLER 3. SEEK CHECKS ARE RETRIED 10 TIMES, EXCEPT THE 3330/50/80 HAVE BEEN RETRIED ALREADY. HRC011DK 4. INTERVENTION REQUIRED - READ THE VOLID; IF PACK WAS CHANGED UNLOAD THE ENVIRONMENTAL BUFFER (3330/40/50/80) AND IF THE VOLUME WAS USED HRC011DK SYSTEM MARK DEVICE OFFLINE (MSG DMKDAS956). IN ANY CASE RESTART THE OPERATION. 5. BUS-OUT CHECK - RETRY THE OPERATION ONCE. 6. DATA CHECKS (2314/2319) ARE RETRIED 256 TIMES WITH RECALIBRATIONS BEING EXECUTED EVERY 16 TIMES. EXCEPTIONS ARE : (A) THE 3330/50/80 HAVE HRC011DK BEEN RETRIED BY THE HARDWARE. (B). 3340 AND 2305 WILL BE RETRIED 10 TIMES. 7. OVERRUN - THE OPERATION IS RETRIED 10 TIMES. 8. MISSING ADDRESS MARKER-THE OPERATION IS RETRIED 10 TIMES. 9. COMMAND REJECT - RETURN TO THE CALLER 10. TRACK CONDITION CHECK - IF THIS IS A DEFECTIVE TRACK CALL DMKTRKIN FOR 3340/3344 DISKS. FOR OTHER TYPES, AN OPERATOR MESSAGE IS ISSUED. 11. END-OF CYL,TRACK OVERFLOW,AND FILE PROTECT CONDITIONS- RETURN TO CALLER. 12. CHAINING CHECK- TEST FOR COMMAND REJECT. IF NOT PRESENT RETRY THE OPERATION 10 TIMES. 13. ENVIRONMENTAL DATA PRESENT HRC011DK (3330/3340/3350/3380/2305) HRC011DK RE-EXECUTE THE ORIGINAL CHANNEL PROGRAM. D. IF THE RETRY PROCEDURE HAS BEEN EXHAUSTED AND UNSUCCESSFUL CALL DMKMSW FOR OPERATION OPTIONS. (I.E. CANCEL,RETRY,IGNORE) THE RESPONSES ALLOWED WILL BE BASED ON THE CONDITION CAUSING THIS ERROR. E. WHEN THE RETRY PROCEDURE IS FINISHED (EITHER CORRECTED OR UNCORRECTABLE), CALL DMKIOEST TO CAUSE STATISTICAL COUNTERS FOR 2314 TYPE DEVICES TO BE UPDATED. F. CYL POSITION VERIFICATION WILL ONLY BE PERFORMED IF THE FIRST CCW IN THE CHANNEL PROGRAM IS A SEEK AND THE SEEK COMMAND IS VALID.
Calls to Other Routines
1. DMKMSW - TO PROVIDE OPERATOR COMMUNICATION IN ATTEMPTING TO CORRECT THE ERROR CONDITION. 2. DMKFREE - TO OBTAIN STORAGE FOR DASD ENVIRONMENTAL SENSE DATA. THIS CONDITION OCCURS WHEN THE CONTROL UNIT INDICATES AN OVERFLOW OF THE USAGE COUNTER. 3. DMKFRET - TO RETURN STORAGE OBTAINED BY DMKFRE 4. DMKQCNWT - TO WRITE MSG DAS956A TO OPERATOR 5. DMKCVTBH - TO CONVERT REAL DEVICE ADDRESS 6. DMKIOEST - TO UPDATE STATISTICAL DATA COUNTERS 7. DMKTRKIN - TO HANDLE TRACK CONDITION CHECKS
ibm/vm370-lib/cp/dmkdas.assemble_abs.txt ยท Last modified: 2023/08/06 13:36 by Site Administrator