I think 6160 was the best half-track blocking for a 3350 using 80-byte records. Lennie
-----Original Message----- From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Pommier, Rex Sent: 18 December 2025 21:46 To: [email protected] Subject: Re: [EXTERNAL] Re: Grrr! Yes, TSO TRANSMIT destroys PDSes (Rant) One thing I've never understood. Why 6160 for a FB/80 sequential dataset? A FB/6160 has 8 blk per track = 49200 bytes of 56664 = 86.9% But bumping it to FB/80/6480 yields 8 blocks per track, 51840 bytes per block, 91.5% utilization. Rex -----Original Message----- From: IBM Mainframe Discussion List <[email protected]> On Behalf Of salva Sent: Thursday, December 18, 2025 3:28 PM To: [email protected] Subject: [EXTERNAL] Re: Grrr! Yes, TSO TRANSMIT destroys PDSes (Rant) A FB 80/27920 has 2 blk per track = 55840 bytes of 56664 = 98.5% A FB/6160 has 8 blk per track = 49200 bytes of 56664 = 86.9% It is a important difference, but not huge. El jue, 18 dic 2025, 22:16, rpinion865 < [email protected]> escribió: > Broken record here. But I see our QR libraries with the following DCB > information FB 80/6160 non-loadlib datasets and U 0/6133 for load > libraries. The libraries are not large, but still why not join at > least the 1990s. > > > > "Confidentially doc, I am the wabbit." > > Bugs Bunny > > Sent with Proton Mail secure email. > > On Thursday, December 18th, 2025 at 3:59 PM, Mike Shaw < > [email protected]> wrote: > > > On Thu, Dec 18, 2025 at 3:39 PM Jon Perryman [email protected] wrote: > > > > > <snip> > > > Sadly, XMIT is as old as TSO and very little has changed over the > > > years because it's rarely used. > > > > Rarely used? > > > > I have the opposite view. I have seen it used by other ISVs many > > times > and > > we use it as part of our product installation process and for > > certain > data > > set backups. It works and it's simple to invoke. > > > > Mike Shaw > > MVS/QuickRef Support Group > > Chicago-Soft, Ltd. > > > > -------------------------------------------------------------------- > > -- For IBM-MAIN subscribe / signoff / archive access instructions, > > send email to [email protected] with the message: INFO > > IBM-MAIN > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, send > email to [email protected] with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
