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From: ron@woan.austin.ibm.com (Ronald S. Woan/2100000)
Newsgroups: comp.periphs.scsi
Subject: [comp.sys.ibm.pc.rt] Re: Risc System/6000
Message-ID: <11159@stag.math.lsa.umich.edu>
Date: 25 Feb 90 05:56:17 GMT
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Original-posting-by: ron@woan.austin.ibm.com (Ronald S. Woan/2100000)
Original-subject: Re: Risc System/6000
Reposted-by: emv@math.lsa.umich.edu (Edward Vielmetti)


In article <542@arccs2.fed.FRB.GOV>, m1phm02@fed.FRB.GOV (Patrick H.
McAllister) writes:
|> A lot of discussion has been going on about the processor
|> performance of these machines, but I would also be interested in
|> knowing something about I/O performance. Does anybody out in
|> netland have any information that can be posted about the disk
|> options? What types of disk, what types of controllers? Access
|> time, transfer rates (in theory and in practice)?  I/O performance
|> would be an important consideration around here.

Your wish is our command. From the announcement that I have before me,
here is a description of the two drives and adapters:

120MB Direct Attached Disk Drive #2120
        Formatted Capacity      120MB
        Form factor             3.5-inch
        Average seek time       23.0ms
        Average latency         8.3ms
        Rotational speed        3600RPM
        Data transfer rate      1.27MB/sec.

320MB SCSI Disk Drive #2540
        Formatted Capacity      320MB
        Form factor             3.5-inch
        Average seek time       12.5ms
        Average latency         7ms
        Rotational speed        4318RPM
        Data transfer rate      2.0MB/sec.
        Interface               SCSI (single ended), synchronous

And here is the SCSI adapter info:

SCSI High-Performance Internal/External I/O Controller #2828
        Up to two internal and two external devices
        conforms to ANSI document X3.131 -- 1986
        accepts multiple commands/device at a time from system
        SCSI burst rate of 4MB/sec (synchronous protocal)
        Acts as SCSI initiator (command issuer)
        SCSI parity support
        One adapter/system
        Micro Channel Interface
                4-byte (32-bit) Bus Master
                Streaming data support
                Address and data parity support
        Standard Micro Channel form factor card

SCSI High-Performance External I/O Controller #2835
        up to seven external devices
        conforms to ANSI document X3.131 -- 1986
        accepts multiple commands/device at a time from system
        SCSI burst rate of 4MB/sec (synchronous protocal)
        Acts as SCSI initiator (command issuer)
        SCSI parity support
        up to two adapters/system
        Micro Channel Interface
                4-byte (32-bit) Bus Master
                Streaming data support
                Address and data parity support
        Standard Micro Channel form factor card

I believe the prices have already been given in past articles, so I
won't take the time to look them up right now.

                                        Cheers,
                                        Ron

+-----All Views Expressed Are My Own And Are Not Necessarily Shared By------+
+------------------------------My Employer----------------------------------+
+ Ronald S. Woan  (IBM VNET)WOAN AT AUSTIN, (AUSTIN)ron@woan.austin.ibm.com +
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