Back in the day, HSM would process requests from tape in File Block ID order. But, when tape technology went to a serpentine pattern, processing in FBID order no longer ensured optimal results for random recalls, so HSM changed to using 1) Priority 2) FIFO. Clients driving a large numbers of concurrent recalls from tape found that this resulted in slower performance. So, we introduced SETSYS TAPEDATASETORDER(FBID). When you know that you will be concurrently recalling a large number of data sets from a single tape, we recommend that you enable this parameter. For general processing, we recommend using the default of Priority. (There are also subparameters to just enable this for Recall or Recover).
Glenn Wilcock HSM Architect ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
