I'll throw a few more random things out here that might be helpful. S99ERROR code x'043C' indicates that the DYNAMNBR value is being exceeded. If you're getting a different error... then it's probably not worth digging around this value.
Allocation requests that ask for an XTIOT don't take space from the 64K (or smaller) TIOT. Also it's a good idea to request DSABs above-the-line and actual UCBs, otherwise you end up with a lot of control blocks in 24-bit storage. There are a few ways to do this, but the easiest is to set the S99DXACU flag in the S99RB - that gives you all three of those options. Also make sure the job class has SWA=ABOVE. Take a look at the number of data sets that are able to be allocated at one time. You can make some guesses about what limit you're running into based on that. The TIOT can hold a maximum of 3273 DDs (and less if they are multi-volume data sets or a DVC is in use.) If they're getting past that limit (maybe into the tens of thousands of allocations), it's more likely that these are XTIOT requests, but some of the other control blocks (such as the DSABs) are going into 24-bit storage. -Scott Ballentine IBM z/OS Device Allocation sbal...@us.ibm.com ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
