And MXG's recommendation is
4. DCB attributes of TMC records need large BUFNO. The TMC records are Fixed Length LRECL=340. If reading under MVS, use very large BUFNO=220 to significantly reduce processing time. -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of retired mainframer Sent: Friday, February 12, 2016 12:48 PM To: [email protected] Subject: Re: Reading the CA-1 Tape Catalog If you are going to use QSAM to read the TMC, remember that while the file is FB with LRECL 340, there are at least three different internal record formats: control records, volume records, and DSNB records (which are actually 170 bytes and therefore "blocked" 2 per "QSAM record"). > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] > On Behalf Of Hardee, Chuck > Sent: Friday, February 12, 2016 5:58 AM > To: [email protected] > Subject: Re: Reading the CA-1 Tape Catalog > > Thanks Russell, I'll go re-read the documentation in the programming guide. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
