>From: "Joel C. Ewing" <[email protected]> > >And better yet, also use a DATACLAS with the Extended attribute so you >are not constrained to only 16 extents per volume. > >With Space Constraint Relief. Extended attribute, and Dynamic Volume >Count, both primary and secondary allocations will use as many extents >and volumes as necessary to get the requested primary or secondary space >(not just the 5 extents for primary, 1 for secondary limits of ordinary >sequential dataset allocation), so fragmentation of free space is less >of an issue. Since you are not guaranteed any minimal amount of space >for any individual extent, you also need the larger extent count limit >given by the Extended data set attribute to insure that you are not >artificially restricted by number of extents from allocating available >free space on the assigned volumes. > >Using these attributes you can even request a primary allocation that >spans multiple volumes and guarantee that step execution will not even >start if a large minimal primary space is unavailable, but you have to >be careful using this because at least in the past the RELEASE option >would not release allocated but unused space on volumes that contained >no written data, only on the last used volume of the data set (so a >multi-volume primary allocation used for a very small dataset could >consume a large amount of pool space on subsequent unused volumes even >after RELEASE). > Joel C Ewing
Joel, I am not sure that would apply to a PDS. I know that for nonvsam sequential files that will work, but I am not sure if it is a PDS if it can go beyound 16 extents. I have been looking through the manauls and cannot find a reference (info center - yuck). Can you comment? Lizette ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
