🚀 go-pugleaf

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 +
+ outside of IBM       @cs.utexas.edu:ibmchs!auschs!woan.austin.ibm.com!ron +
+ last resort                                        woan@peyote.cactus.org +

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.

Disk I/O is _ALL_ SCSI.  Even the biggest machines.

Disks come in 5 sizes, 120Mb -> 857Mb.  Seek times down to 12.2 ms,
latency 6ms, transfer rate 1.2 to 3 MB/sec.

(Data from information pack handed out at Australian product launch)
-- 
Gregory Bond (gnb@melba.bby.oz), Burdett, Buckeridge & Young Ltd., Melbourne
The IBM dictionary: ``Open Systems'' - has a bastardized Unix and an optional
ethernet connector.
--
Gregory Bond, Burdett Buckeridge & Young Ltd, Melbourne, Australia
Internet: gnb@melba.bby.oz.au    non-MX: gnb%melba.bby.oz@uunet.uu.net
Uucp: {uunet,pyramid,ubc-cs,ukc,mcvax,prlb2,nttlab...}!munnari!melba.bby.oz!gnb
-- 
Gregory Bond, Burdett Buckeridge & Young Ltd, Melbourne, Australia
Internet: gnb@melba.bby.oz.au    non-MX: gnb%melba.bby.oz@uunet.uu.net
Uucp: {uunet,pyramid,ubc-cs,ukc,mcvax,prlb2,nttlab...}!munnari!melba.bby.oz!gnb