Path: utzoo!attcan!uunet!cs.utexas.edu!uwm.edu!srcsip!jhereg!com50!chris From: chris@com50.c2s.mn.org (Chris Johnson) Newsgroups: comp.periphs.scsi Subject: Re: Installing Wren VII on Sun Keywords: Wren VII, Sun Message-ID: <1990Jun8.223303.440@com50.c2s.mn.org> Date: 8 Jun 90 22:33:03 GMT References: <1990Jun6.211328.13096@utu.fi> Organization: Com Squared Systems, Inc. Lines: 37 In article kusumoto@chsun1.uchicago.edu (Bob Kusumoto) writes: >moj@mirfak.utu.fi (Matti Jokinen) writes: >>I am looking for instructions on installing a CDC Wren VII 94601-12G disk >>on a Sun-4 running SunOS 4.0.3. Especially, I would like to know how to >>write the entries in /etc/format.dat. Wren VII has an unusual geometry: >>bit density is constant and the number of sectors per track is variable. >>I wonder if it really is possible to get optimal performance under SunOS. > >just a quick note, I wrote a message that's in the sun-spot archives about >this. I don't have a copy but I'll gloss over it real quick. > >in format.dat, you can add an entry to look like: > >disk_type = "CDC Wren VII 94601-12G" \ > : ctlr = MD21 : fmt_time = 4 : cache = 0x11 \ > : ncyl = 1925 : acyl = 2 : pcyl = 1931 : nhead = 15 : nsect = 70 \ > : rpm = 3600 : bpt = 41301 > >you can change the nsect parameter to try and push more space on your drive, >although I doubt and highly do not recommend that you increase it to the >theoretical max of 80. > Here's the entry I use here with Wren VII's running under SunOS 4.0.3c on our Sparcstations. It works just fine, and note that it uses a bit more of the available disk space. disk_type = "Imprimis Wren VII 94601-15" \ : ctlr = MD21 : fmt_time = 4 \ : cache = 0x11 : trks_zone = 15 : asect = 0 \ : ncyl = 1947 : acyl = 2 : pcyl = 1949 : nhead = 13 : nsect = 80 \ : rpm = 3597 : bpt = 41301 -- ...Chris Johnson chris@c2s.mn.org ..uunet!bungia!com50!chris Com Squared Systems, Inc. St. Paul, MN USA +1 612 452 9522