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Directory size of symbol resolution tables for other networks z/OS Communications Server: SNA Customization SC27-3666-00 |
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This constant specifies the number of queue pointers in every SRT directory for networks other than this VTAM® network (that is, all networks with a network ID other than the network ID of this VTAM specified on the BUILD and NETWORK macroinstructions that are included in the NCP definition program). The IBM-supplied default value is 43. You can change the number of SRT entry queues in each directory by specifying a number in the range 0–32767 (X'7FFF'). If you specify 0, VTAM uses the default value of 43. Using a prime number of queue pointers results in a fairly even distribution of SRT entries to the queues. It is advisable that you choose a prime number. Note: For networks with a large number of LUs, increasing this number
shortens the length of the queues, thereby decreasing the logon time.
See the following instructions and information before changing
the default directory size. To estimate the number of entries in the
other network's symbol resolution table (SRT), add the following:
Divide the number of entries in the other network's symbol resolution table by two times the size of the other network symbol resolution table, OSRTSIZE, to obtain an average SRT queue depth. Performance increases as the SRT queue depth decreases. Therefore the larger the size of the SRT table, the better the performance. Making the table larger can improve in two ways:
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Copyright IBM Corporation 1990, 2014
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