On Thu, Apr 18, 2002 at 10:44:39AM -0500, Rick Troth wrote: > And what will happen now with SCSI attachment to zSeries? > I can only hope that there will NOT be some CKD protocol. > It just doesn't seem worth it when FBA is what is really happening.
Probably so, at least for VM, VSE, and Linux. > With CKD, Linux must play the C/H/S game. > With emulated CKD, so must the DASD subsystem. > Why not let both ends stop faking it?? Mainframers - at least MVS types - aren't used to thinking that way. A sile as a stream of bytes is completely alien to them. > But VSE and VM both work with FBA DASD. VM has always used a fixed-block structured filesystem internally anyway, so it was just a matter of changing block sizes. I can't speak to VSE, never having dealt with it. > I'm not saying that we should endorse FBA to the demise of MVS. > I am only saying that we should endorse FBA to the benefit of > Linux, VM, and VSE. And with modern DASD subsystems, > it should be no great pain to present either flavor as needed. > Let MVS have its CKD. But let the rest have FBA when they want. I believe that's the case now. There's one benefit for Hercules users of using CKD instead of FBA: compressed DASD images. Compressed CKD is a big win. Unfortunately, there's no compressed FBA support.
