Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!rice!sun-spots-request From: kriger@xylogics.com (Sidney Kriger) Newsgroups: comp.sys.sun Subject: Re: info needed: IPI disk Keywords: Hardware Message-ID: <5905@brazos.Rice.edu> Date: 19 Mar 90 21:36:07 GMT Sender: root@rice.edu Organization: Sun-Spots Lines: 38 Approved: Sun-Spots@rice.edu X-Refs: Original: v9n82 X-Sun-Spots-Digest: Volume 9, Issue 89, message 2 In article <5752@brazos.Rice.edu> era@ncar.ucar.edu (Ed Arnold) writes: >X-Sun-Spots-Digest: Volume 9, Issue 82, message 7 > >... This leaves the CDC-97209-12G >and the CDC-97229-12G. These are supposedly IPI-2 disk drives with a 1.2 >Gbyte unformatted capacity. First, you had correctly identified which Seagate (acquired Imprimis from CDC) drives were IPI-2 drives and what the distinctions were. The CDC-97209-12G and the CDC-97229-12G are both IPI-2 drives. The CDC-97209-12G operates at 3 MB/s. The CDC-97229-12G has a burst data transfer rate of 6 MB/s. This drive achieves 6 MB/s by splitting the data on WRITEs between two 3 MB/s heads as they write data in parallel to different physical disk locations and by interleaving the data read by the two heads back together on READs. The unformatted capacity of each model is 1.2 GB. Secondly, Sun does manufacture its own IPI-2 disk controller. IPI-2 will be available from third party vendors. Fujitsu, Hitachi, NEC and Seagate (alphabetical order only) all manufacture IPI-2 disk drives. They can supply information on their IPI-2 disk drive models, capacities, burst data transfer rates and availabilities. Xylogics IPI-2 disk controllers will be available from our distributors for delivery in early May. The SV7890 is a dual-channel IPI-2 disk controller and the SV6890 is a single-channel model. The dual-channel model acts like two controllers operating in parallel, doubling the capacity and nearly doubling the transfer rate for a single slot when compared with a single-channel controller. We have integrated our controllers with the four manufacturers' drives, including the CDC-97229-12G. Xylogics will support IPI-2 on Sun-3 and Sun-4 platforms running SunOS 4.0 and up, although we may limit support to certain models early on. Sidney Kriger Xylogics, Inc. email: kriger@Xylogics.COM 53 Third Ave. voice: 617-272-8140 Burlington, MA 01803 fax: 617-273-5392