When issuing D STOR it may happen that the number in field "Overflows" is greater than zero, but Slot 12 shows no Failed Requests. How can this happen?
Article ID: 51162
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Issue/Introduction
Description:
D STOR gives information about the storage usage below the 16MB-line. You are getting information about failed Slot Requests and Overflows. These Overflows are normally caused by a failed request for a Slot12-Storage (normally of size 10k).
Solution:
When issuing D STOR it may happen that the number in field "Overflows" is greater than zero, but Slot 12 shows no Failed Requests. like shown below in this example of the Output of a D STOR command:
TPX ******************* TPX Operator ************************* TGE0217
Storage Statistics (Below 16M line)
Open ACBs: 1852 Total ACBs: 03869 Terminals: 1711 Applications: 3075
DSA Bytes: 04771840 Current Use: 013% High Use: 019% Free Areas: 0005
Slot Bytes: 01114112 Current Use: 000% High Use: 006% Overflows: 00439
Slot Size * Count = Bytes Curr.Use Max.Use Failed Requests
01 00008 3072 24576 000 % 000 % 0 4078
02 00016 1536 24576 000 % 000 % 0 20873186
03 00032 768 24576 000 % 000 % 0 601440
04 00064 384 24576 008 % 010 % 0 490478
05 00128 192 24576 006 % 031 % 0 2292120
06 00256 336 86016 000 % 003 % 0 1943064
07 00512 72 36864 001 % 008 % 0 387088
08 01024 48 49152 000 % 012 % 0 184934
09 02048 80 163840 000 % 018 % 0 3797037
10 04096 72 294912 000 % 008 % 0 774380
11 08192 24 196608 000 % 012 % 0 153061
12 10240 16 163840 000 % 006 % 0 62227
******************************** BOTTOM OF DATA ***************************
You can see that there are Overflows but no failed request for Slot 12.
The reason for these number of overflows is a GETSTOR request from TPX with LOC=BELOW,SLOT=YES and BYTES>10240. In several functions TPX issues such a GETSTOR LOC=BELOW,SLOT=YES where the number of bytes requested is calculated for the current situation. If the number of bytes is larger than the size of Slot 12 TPX will not modify the GETSTOR into SLOT=NO. It will leave this as SLOT=YES resulting in an increase of the overflow counter.
There is nothing to worry about this behavior. The storage is taken from DSA. If the values "High Use:" for the DSA- and the Slot-Storage are below the given thresholds then TPX runs normal. We suggest to observe the storage on a regular basis by using the concept of OPENGATE-User. You find more information about this in Technical Document TEC424715 and Videos TEC509132 and TEC509894.
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