Are you saying that TRUNC is no longer supported? Charles
-----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Ed Gould Sent: Wednesday, July 05, 2006 12:44 PM To: [email protected] Subject: Re: avgrec/avgblk history ? On Jul 5, 2006, at 9:25 AM, Paul Gilmartin wrote: ---------------------SNIP-------------------------- >> > I don't understand "unused space at the end of each block". Surely > the interblock gap isn't larger by that amount, so the unused space > must exist within the block. The only way I know this can occur is > if RECFM=VBS and the block ends with a null segment. I don't believe > this is commonly done. At some time in previous history (pre MVS?) QSAM did allow for short blocks at anyplace in the dataset (including the last block). UNLESS it was created with FBS as the recfm=. I *think* that with SAMe it became standard practice for all blocks (except the last one) to be "full" (ie the blocksize of the dataset). I believe that today blocks are written so that the are "filled up" (ie FBS). VBS is another animal entirely. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
