I have an old STK tape system ( ten 9840's in 3490 emulation mode inside a 9740. Each drive ESCON point to point) , that will hopefully go away but ....
I have an issue with HSM dump running longer than expected. The problem appears disconnect time. During the HSM dumps, we're using four drives for two DumpClasses and most other stuff is stopped (some FTPs will come in). No other tasks or LPAR is using any tape drive. Cpu is in the low 20% range, DASD service time is around 4 ms and DASD rate is around 50 and tape rate is around 600. One set of tape drives (1 tape for each of the two DumpClasses) has an RMF average disconnect time of .84 and the other set of drives has an average disconnect time of .06. This translates into a difference of 40k SIO in a 15 minute interval. This disparity will last for almost an hour, then the high disconnect time goes away (still using the same four tapes and drives). SMF21 doesn't indicate any Erase Gaps or temporary errors which I know causes high disconnect times. Jack Kelly 202-502-2390 (Office) ---------------------------------------------------------------------- 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
