Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!utgpu!water!watnot!watmath!clyde!cbatt!ucbvax!era@mimsy.umd.edu@seismo.UUCP From: era@mimsy.umd.edu@seismo.UUCP Newsgroups: mod.computers.pyramid Subject: Submission for mod-computers-pyramid Message-ID: <8702232358.AA00753@scdpyr.UCAR.EDU> Date: Mon, 23-Feb-87 18:57:54 EST Article-I.D.: scdpyr.8702232358.AA00753 Posted: Mon Feb 23 18:57:54 1987 Date-Received: Thu, 26-Feb-87 21:19:30 EST Sender: daemon@ucbvax.BERKELEY.EDU Organization: The ARPA Internet Lines: 42 Approved: info-pyramid@mimsy.umd.edu Path: scdpyr!era From: era@scdpyr.UUCP (Ed Arnold) Newsgroups: mod.computers.pyramid Subject: wanted: "best" tape drive for 90x Keywords: pyramid 90x tape fujitsu kennedy Message-ID: <40@scdpyr.UUCP> Date: 23 Feb 87 23:57:53 GMT Distribution: na Organization: Natl Ctr Atmospheric Research, Boulder, CO Lines: 31 I'm seeking info from anyone who has attached either a Fuji M2444 or Kennedy 9401 to a 90x (thru an IOC, of course). Since the 90x (OSx 3.0) I'm working on isn't source licensed, I can't look at the tape driver. I'm trying to evaluate a loaner 2444. It's set up in Cipher F880 compatible mode (CE manual, page 6-35) and with the buffer xsfer rate at 250 kbyte/sec (CE manual, page 4-58). In this configuration, at 6250 density, the best transfer rate to tape (single-user mode, 10240-byte blocks) is about 104 kbyte/sec, which doesn't seem very good. (Setting higher buffer transfer rates causes tapeintr() to croak.) My questions are: (1) Is there any combination of Fuji parameters which will give us a better transfer rate on a 90x? In particular, if we should be using the Fuji's CDC or PERTEC modes, what value of "ioctapetype" in conf.c does this correspond to? (We're currently using "MT_UNKNOWN". There is a "MT_FUJITSUM2444AC" type, but the sys admin manual doesn't reveal whether that corresponds to CDC or PERTEC mode, and using that value in Cipher mode doesn't work at all.) (2) Is there anyone out there with a 90x/Kennedy 9401 who achieves a significantly better transfer rate than 104 kbyte/sec? (If we can get better throughput with a 9401, we would consider spending the extra money.) Thanks for your assistance ... -- Ed Arnold * NCAR (Nat'l Center for Atmospheric Research) PO Box 3000 * Boulder, CO 80307-3000 * 303-497-1253 era@ncar.csnet * era@scdsw1.{arpa,ucar.edu} * era@scdpyr.uucp * era%scdsw1.arpa@wiscvm.bitnet