Do you have MXG? They have a program, ANALSMF, which will analyze your current SMF. In general, what I've done and which seemed to help:
Set MANx CISIZE to half track (26624). In your IFASMFDP JCL to dump a full MANx dataset (we use IEFU29 to issue a start for SMFDUMP JCL to dump one whenever it is full, your method may vary), use this for the input, so &SMFDS represents the MANx dataset name. //SMF DD DISP=SHR, // AMP='BUFND=60', // DSN=&SMFDS 60 buffers = 2 cylinders if you are using half track CI sizes. On the output sequential datasets on disk we use RECFM=VBS,LRECL=32760,BLKSIZE=0 and let the system choose the blocking. The last time we did this we had SMS turn on compression for these so it shows BLKSIZE=32760 but I believe if you don't use compression the system will choose half-track blocking. Keep in mind that compression uses CPU time unless you have zEDC. The important part: we use BUFNO=60 to match the input. We never tested whether output needed to be larger than input, or not. If you have huge amounts of data you might consider using striping for the output if it is going to disk; I don't know how much it will help elapsed time for the dump but it will help the elapsed time of whatever uses the data. I tested it once but we didn't implement it. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
