ronjhawk...@sbcglobal.net (Ron Hawkins) writes: > I didn't get to work with the 3880-13, but with the 3880-23 I think I recall > sequential pre-fetch was initially fetching three tracks, using a > wrap-around buffer to keep track of the last block read and maintaining two > tracks beyond the last track accessed in cache. > > With 3990-3 I think this increased to five tracks, and I have no idea about > 3990-6 and beyond.
re: http://www.garlic.com/~lynn/2012d.html#72 megabytes per second http://www.garlic.com/~lynn/2012d.html#75 megabytes per second http://www.garlic.com/~lynn/2012d.html#76 megabytes per second this mentions that sequential detect is new function as of June1996 for 3990-6 ftp://public.dhe.ibm.com/eserver/zseries/zos/vse/pdf3/veioperf.pdf -- virtualization experience starting Jan1968, online at home since Mar1970 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: INFO IBM-MAIN
