On Fri, 1 Sep 2006 21:26:49 +1000, Shane wrote: >On Fri, 2006-09-01 at 13:13 +0200, R.S. wrote: >... >> It is also possible to change the application. Get rid of old stinking >> tape DDnames with 50MB datasets. Use DASD instead. Exploit TMM, HSM, >> ML1&2. The need for virtual tapes will also decrease. > >Nope. Not even close. >The MIP/MSU/M-thingy cost of HSM in a decent sized TMM environment is >bloody horrendous. Outrageous even. >Not to mention the (mainframe) DASD cost. >The ML1 occupancy is way too expensive. And it gets in the way of all >the other HSM housekeeping - *and* it's all charged at mainframe MIPs >rates. Just a non-optimal solution. > >TMM for *SMALL* usage works. Once it grows, virtual tape wins hands >down. The voice of reason downunder (Shane) points out that I got it wrong yesterday. We don't need a "zEEP" (encryption processor) anywhere near as badly as we need a "zOOP" (Optimized Offload processor) to push DFHSM onto and buy back a WHOLE lot of general CP MIPS/MSUs/thingies. Certainly at my present employer's shop we'd see more benefit if HSM had a new style CP to devour. (Although we're embarking on an unbelievable amount of encryption very soon, which will eat up our encryption co-processors in a heartbeat.) I might even suggest that some more of what DFHSM does should be pushed into the disk and tape controllers themselves except (a) I want to see how reliable the tape drive encryption runs first and (b) IBM would apparently not retrofit that into the controllers in the field. I really would have liked the tape encryption announcement much better if IBM would have retrofitted it into existing (or even new model) 3490s. I wonder how many "lost tape" incidents with banks have happened with 3590 tapes vs. 3490 tapes? -- Tom Schmidt Madison, WI (Or maybe it should be a "zUUP" (Universal Utility processor)? Either way the standard seem to be to double-up on the vowels, right?)
---------------------------------------------------------------------- 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
