Sorry, I misunderstood the question. In IBM's TS7700, you can only select MEDIA1 or MEDIA2 as they only emulate 3490 and 3490E. 18-track and 36-track. I only use MEDIA2, with dataclas assigning either 6GB or 25GB volume sizes.
I don't know about other virtual tape systems, which may be able to emulate EFMTx formats. On Tue, 23 May 2023 at 05:03, Radoslaw Skorupka < 00000471ebeac275-dmarc-requ...@listserv.ua.edu> wrote: > That's good answer to the question not asked. > Yes, different categories are good for multi-tenancy, even if it is set > of RMM, each having own db. > However I'm asking for the reason for having multiple categories > logically assigned to single system. > I excluded various (virtual) tape capacities since the capacity is now > set up by dataclass. So, why should one have more than one scratch > category, still assuming there is one z/OS image? > > > > -- > Radoslaw Skorupka > Lodz, Poland > > > > W dniu 20.05.2023 o 05:20, Brian Fraser pisze: > > If different LPARs using the tape library have different TMCs, then they > > must also have different category codes assigned so the correct tapes are > > used for scratch mounts. > > > > > > On Sat, 20 May 2023 at 02:43, Radoslaw Skorupka < > > 00000471ebeac275-dmarc-requ...@listserv.ua.edu> wrote: > > > >> Volume categories (0001, 0002, and so on) are useful for library > >> partitioning. Each SMS-plex can use it's own set of categories (00x1, > >> 00x2...). > >> Categorie are good to request big tape of small tape (JA, JK) or newer > >> or older (JB, JC...). > >> However the last sentence was good for real tapes. > >> In VTS world we have virtual tapes and the max. volume size is > >> determined in DATA CLASS construct - so one can have several sizes > >> within category. > >> > >> So, the question arises: what is a purpose to have multiple categories > >> for one SMS-plex? Of course, there is no obligation to more than one > >> scratch category, however what goal can be achieved by using more than > one? > >> I see the only one: different scratch Expiration settings. > >> > >> BTW: all the volumes and drives are emulated, but... are there any > >> architectural limits (i.e. volume size) resulting from choice o CAT 00x1 > >> aka MEDIA1 vs 00x2, etc. ? > >> > >> Rather obvious, but I want to ask: is there any reason to define more > >> categories, that means for MEDIA3 and above? > >> In real tape world 3490E drive was completely incompatible with MEDIA3, > >> 4, etc. > >> And the VTS allows to insert only CST (MEDIA1) and ECCST (MEDIA2) > >> virtual volumes. > >> > >> -- > >> Radoslaw Skorupka > >> Lodz, Poland > >> > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
