On 6/21/2011 10:51 AM, Minoru Massaki wrote: > As Mike told, in real 3490E, block count in block ID (32-bits) is 22-bits > long. > High order 10-bits in 3490E block ID is used other purpose. > In case of 3590 as well as 3592, the block count is 32-bits long. > > But in 3490E emulation mode of 3590/3592, you can use 32-bits block count. > > I think that STK T1000, Bus-Tech MDL, as well as TS7700 provide > 32-bits block count to utilize large capacity media. > > I coud not find APAR OW49829 which supports 32-bits block count. > > Please look at 3590/3592 Introduction and Planning Guide and old > Redbook IBM 3590 Multiplatform Implementation SG24-2594. > In addition to this, please look at DCBE macro description in DFSMS > Macro Instructions for Data Sets. DECB macro has a parameter > CAPACITYMODE=XCAP. > > > Minoru Massaki > > 2011/6/21 Mike Wood<mikeww...@hotmail.com>: >> Radoslaw, I believe the 'limit' that most likely causes problems is the >> block ID. >> 3490/3590 devices use different formats. If you look at the doc for the NOTE >> and POINT macros for sequential data sets in DFSMS pubs you will get some >> idea of the differences. >> Basically, the 3490 blkid limited the number of blocks written to the tape. >> When small blocks are used you might not be able to use the entire tape >> media. The blkid for 3590 supports many more blocks. >> >> Depending on how the data is accessed, having more blocks on an emulated >> tape than can be addressed by blkid, may not be a problem. Or, perhaps the >> emulation uses newer blkid format, and as long as mvs does not manipulate >> them, they likely work ok. >> >> As for tape capacity, the system has always made assumptions about this >> based on the media and recording format detected and used. However, with >> virtual devices, there was recent support added ( library and dfsms) to >> allow the library to pass the volume capacity to the system. You can see a >> field in the IFGTEP control blocks where the capacity can be passed from >> OPEN to the tape management system - this works for all real '3590' and >> recent IBM virtual library levels. >> >> Mike Wood >>
Minoru-さん, I remember, we met at SHARE in Denver in 2009. So, you got a job in mainframes after all! Great. Who are you working for these days? My wife and I will be leading a trip to Japan this October (Tokyo, Takayama, Hiroshima, Kyoto). Maybe we can meet for a brief time. You can see details of the trip here: http://www.trainersfriend.com/japan -- Kind regards, -Steve Comstock The Trainer's Friend, Inc. 303-393-8716 http://www.trainersfriend.com * To get a good Return on your Investment, first make an investment! + Training your people is an excellent investment * Try our new tool for calculating your Return On Investment for training dollars at http://www.trainersfriend.com/ROI/roi.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
