Alan, I think I was the one that mentioned TCM, I haven't seen anything back from Alain as yet. But that to me is the mostly likely reason he got 3339 cylinders when he was expecting a standard 3380K - the DS8300 had the volume set up as a 3390 in 3380 TCM. This would not cause him any problems - he is free to use the extra space if he wants or can. I would think the person who configured the DS8300 might want to review the setup, but Alain really does have 3339 cylinders and can use them. As long as my guess - a TCM mode 3390 - is correct.
Ron On Sun, Nov 30, 2008 at 11:45 PM, Alan Altmark <[EMAIL PROTECTED]> wrote: > On Thursday, 11/27/2008 at 02:09 EST, Alain Benveniste > <[EMAIL PROTECTED]> wrote: >> It was not a question but just a post to a previous opened thread called >> 'DASD VOLUME SIZES'. I probably did a wrong manipulation since I thought > to >> give a 'proof' of what I said... a 3380-3 seen with 3339 cyls through > the cp >> q da details cmd. > > I went back and re-read previous posts and I'm still not clear on on what > you think is not working (if anything). > >> With a DS8300, that we use for DR, we saw that coding 0 END in a MDISK > for a >> 3380-K will give a wrong result when starting a MVS and checking the > vtoc in >> 3.4. 3380-K were emulated as expected but the size of the 3380-K was > equal >> to a 3390-3. So you could believe you have enough space to run your prod > on >> that dasd but your prod will fail with a "no more space available". > >> ICK00700I DEVICE INFORMATION FOR F17F IS CURRENTLY AS FOLLOWS: >> PHYSICAL DEVICE = 3390 >> LOGICAL DEVICE = 3380 >> STORAGE CONTROLLER = 3990 >> STORAGE CONTROL DESCRIPTOR = E9 >> DEVICE DESCRIPTOR = 9E >> ADDITIONAL DEVICE INFORMATION = 4A001F3C >> TRKS/CYL = 15, # PRIMARY CYLS = 3339 > > Everything is as it should be. A 3390-3 operating in 3380 Track > Compatiblity Mode (TCM) returns 3380-9E in the Read Device Characteristics > CCW and a size of 3339 cyls. Read More About It in the ESS S/390 Command > Reference, SC26-7298 (appendix A). > > TCM is only at the track level, not the device level. If you want to know > if the product operates on a 3380-1 (A/D/J), -2 (E), or -3 (K), you can > probably get closer by using 3380 TCM under a minidisk of 885, 1770, or > 2655 cyls. > > But if someone thinks that 3380 TCM means "emulate a 3380" they are wrong. > > Alan Altmark > z/VM Development > IBM Endicott >
