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Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!amdahl!dlb!megatest!palowoda
From: palowoda@megatest.UUCP (Bob Palowoda)
Newsgroups: comp.unix.microport,comp.unix.xenix,comp.binaries.ibm.pc.d
Subject: Re: Request for disk info
Message-ID: <3239@megatest.UUCP>
Date: 1 Apr 89 07:00:33 GMT
References: <7715@killer.Dallas.TX.US>
Organization: Megatest Corporation, San Jose, Ca
Lines: 41

From article <7715@killer.Dallas.TX.US>, by larryd1@killer.Dallas.TX.US (Larry Clark):
> 
>      My employeer has need of large, high reliable disk drives with high
>      data transfer drives. The micropopolis esdi drives meet the data
>      transfer rates nicely, but their mtbf falls short by some 10,000 hours.
> 
>      Can anyone recommend a manufactorer who makes drives that have a
>      capacity of 150 megs or greater and a MTBF of 50,000 hours?  Price is
>      not a factor, but data transfer rate is, so I suspect that ST506 is
>      out and esdi or scsi is in.
> 
>      Thanks
>       Larry D. Clark

  I beleive Core International and Prime have 50,000 mtbf. Actually Prime
  has a 5 year warrenty of some sort which works out to be 43,000 mtbf.
  I once worked in a QA department that derived these figures from one year 
  data. What I would be interested in is what bearing manufacture is used
  for what drive.

  On the subject of disk transfer rates I have been reading some interesting
  results of these benchmarks in MIPS magazine. The one that caught my  
  attention is the Rupp 386 machine using a ESDI controller with cache for
  the controller. Other ESDI setups transfered 100k/bytes/sec (1meg/1task)
  and the Rupp controller did over 400k/bytes/sec(1meg/1task). 
  Rupp Computer products advertise this disk controller as "PM3011 Caching
  Controller". List for 1150.00. Does anyone know who manufactures this 
  controller?

  Another question is how do different ESDI device drivers affect the 
  disk tranfer rate. And why or how did the caching controller override
  this limitation?

  ---Bob


-- 
 Bob Palowoda                               
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