Path: utzoo!dciem!nrcaer!fts1!atronx!rwm
From: rwm@atronx.UUCP (Russell McOrmond)
Newsgroups: comp.sys.amiga.hardware
Subject: A2091 & CDC Wren III
Message-ID: <2032.AA2032@atronx>
Date: 23 Feb 90 07:48:29 GMT
Followup-To: comp.sys.amiga.hardware
Organization: AmigaTronix Network Support (1:163/109)
Lines: 75



Hi,

  Seems a message to CBMVAX bounced (This is the first time), but I assume
it would go if sent a second time - I think this is best posted public anyways.


  I have a friend that has a DC WREN II which is a 155M 16.5ms access drive. This
drive was hooked up to a 2090 for a few years, a 2090a for a couple of months,
and is now working on a 2091 controller.

  The upgrade to the 2091 controller was made in order to get a speed increase 
with access to the Drive. This did not seem to happen with this unit, and
now I question anyone out there (Expecially Dave H) as to any possibilities
why, and any possible fixes.


  While it is no definitive test, we used DiskPerf3 on this drive, on an
empty partition, with all 3 controllers.  I will show the figures given for
three different tests.


2090A - 140MPartition, FFS

Create : 15  Delete 45
Directory Scans : 92 entries/sec
Seek/Read test  : 97 seek/reads per second

R/W speed:    Buf 1K   Rd   57508   wr  53137
              Buf 8K   Rd  308404   wr 181833
              Buf 32K  Rd  455902   wr 251658

2090A, 10M partition, OFS

Create : 10  Delete 27
Directory Scans : 40 entries/sec
Seek/Read test  : 68 seek/reads per second

R/W speed:    Buf 1K   Rd   40124   wr  17672
              Buf 8K   Rd   47662   wr  21283
              Buf 32K  Rd   48695   wr  21952

2091, 100M partition, FFS

Create : 12  Delete 29
Directory Scans : 104 entries/sec
Seek/Read test  : 53 seek/reads per second

R/W speed:    Buf 1K   Rd   49617   wr  46125
              Buf 8K   Rd  218453   wr 174762
              Buf 32K  Rd  499321   wr 296766


As these 'indicate'  (Yes, I realize that DiskPerf values are kinda like
'MIPS' values - Doesn't show much to anyone) the 2091 did not help with actual
seeking (Much lower value than 2090a, and only showed an increase in transer
rate when working with much larger buffers (P.S. the 'Buffers' for the partition
itself were all equal between these tests).  

  Now, I have spoken to other people with the A2091, and they have mentioned
RADICALLY higher ratings with the same drive moved from the 2090a - is this
something that could be specific to the CDC drive? Any thoughts would be
appreciated.

:Later


--
  Opinions expressed in this message are my Own.  My Employer does not even
know what these networks ARE.

  Russell McOrmond   rwm@atronx   fts1!atronx!rwm  alzabo!atronx!rwm
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