On Mon, 24 Oct 2011 09:12:00 -0400, Lizette Koehler wrote: >>Did I miss the announcement that block sizes greater than 32K are >>supported? What release was that? >> >> -- >> Tom Marchant > > >Okay a slight clarification. 32K is the largest I know of for full track >blocking on DASD.
Ok. 32K has been supported for a long time, but it is less than full track on 3380 and 3390. >Track Blocking revolves around the architecture of the DASD. And of course >that is changing with EAVs and TAPE. EAVs have more cylinders, but the track size and the number of tracks per cylinder is the same as for any other 3390. >If you are running on OS/390 2.10 or later, then you know that BSAM, BPAM >and QSAM support LBI on disk, tape, spooled, subsystem and dummy data sets >From DFSMS: Using Data Sets for z/OS 1.13: Section 3.2.3.1.1 Large Block Interface (LBI): "Currently blocks of more than 32 760 bytes are supported only on tape, dummy data sets, and BSAM UNIX files." So still no full track blocking. Thanks for the clarification. -- Tom Marchant ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
