At 09:49 AM 1/8/2008, you wrote: >I worked with an IBM 360/65 that had one MB of IBM LCS and later 2 MB >of LCS from some other OEM when I was a student. This 360/65 had 3 >frames of main storage, each with 256 KB of storage. The way I >remember it, we could ask for more LCS than main, but it was much slower. >You could specify that data in COMMON as well as data buffers reside >in the LCS under OS MVT. The LCS slowdown was noticable because the CPU >had to wait longer for all data coming in/out of LCS and, of course, the >CPU time was still ticking. I don't know if it slowed down channel >access much. > >Ben Alford Enterprise Systems Programming >University of Tennessee
One of the biggest problems with LCS was channel overruns, Ben. DASD I/O buffers almost inevitably had to be in HIARCHY 0 memory. Data could then be copied / moved to HIARCHY 1 for (slow) computation, etc. Michael Stack Product Developer NEON Enterprise Software, Inc. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
