How to Tune CA XCOM for AS/400 i5/OS for Performance

Document ID : KB000028143
Last Modified Date : 14/01/2019
Show Technical Document Details

Tuning CA XCOM for AS/400 i5/OS for Performance

Items to check when tuning for performance on XCOM for AS/400 i5/OS
  • For SNA transfers, check the mode that you are using. Use a mode with larger rusizes and pacing if appropriate.
  • For TCP/IP transfers, increase the MAXCLIENTS (number of slaves) and the MAXBACKLOG parameter (number of waiting transfers) if appropriate.
  • Compression. Depending on the type of data, compression may increase throughput. Test with your data to determine which compression methods are most effective in your environment. ¬†With high speed links, no compression may be best.
  • Make sure the Communication Trace is off
  • Submit enqueued transfers instead of nonqueued transfers.
  • Make sure that you have sessions available with the XCOMBGP process to handle the load for enqueued transfers.
  • Upgrade to the latest release and make sure all maintenance is applied. Check this by entering the following on the command line
    • "CALL XCOMVER". This will tell you if you are running that genlevel.
  • When initiating transfers from AS/400 you may specify the BLOCKDATA parameter. The parameter is for record packing and can improve transfer speed considerably.
  • Checkpointing can be very useful if you have a long running transfer. However, with a high speed, dependable link, or if you are transferring relatively small files, it may be unnecessary. Buffers are written on the receiving system every time a checkpoint is taken which increases overhead. Raise the checkpoint value or turn off checkpointing if appropriate. Turn off checkpointing by setting it to 0.