Path: utzoo!mnetor!uunet!husc6!bloom-beacon!oberon!pollux.usc.edu!papa
From: papa@pollux.usc.edu (Marco Papa)
Newsgroups: comp.sys.amiga
Subject: Re: A2090 controller
Message-ID: <7992@oberon.USC.EDU>
Date: 30 Mar 88 22:16:26 GMT
References: <2911@leo.UUCP>
Sender: news@oberon.USC.EDU
Reply-To: papa@pollux.usc.edu (Marco Papa)
Organization: Felsina Software, Los Angeles, CA
Lines: 33

In article <2911@leo.UUCP| harald@leo.UUCP ( Harald Milne) writes:
|	For reasons I can't understand, (and I do understand the reasons
|for SCSI speed improvements) the A2090 seems do better. My A2000 has
|a very snappy response compared to the A1000 with SCSI. With all things
|being equal (like number of top level directories, diskbuffers, etc)
|and things being unequal (SCSI track buffering, average access times)
|this is really strange.
|	I don't have any notion of A2090 SCSI performance, so I can't even
|even talk about this, but considering the supposed performance advantages
|of SCSI against the A2090 controller with a slow access (40ms) 251 drive,
|I'll be dammed if the A2090 doesn't kick ass so to speak. As if the A2090
|provides SCSI performanc with an ordinary ST506. (Quite possible)
|
|	I don't know, and I don't have hard numbers, but the A2090 really
|kicks.
|	Needless to say, I'm impressed with the A2090 controller in this
|configuration.
|
|	Any comments?

I have your same configuration (A2090 and ST251) and I concur completely
with your assessment. Even more. I have partitioned the ST251 with an FFS
(Fast File System) partition (1.3 Gamma).  Icons come up from that partition
AS FAST AS from the 1.3 C-A Recoverable RAM Disk.  Note that I DON't have the 
"fast" 28msec ST251-1, but the "slow" ST251 (40 msec).

-- Marco Papa

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