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From: sritacco@hpdmd48.boi.hp.com (Steve Ritacco)
Newsgroups: comp.sys.dec
Subject: Help with DECstation disks.
Message-ID: <15500019@hpdmd48.boi.hp.com>
Date: 18 Sep 90 14:53:53 GMT
Organization: Hewlett Packard - Boise, ID
Lines: 20

I tried posting this ounce, but didn't get any replies.  My note probably 
didn't make it out.

I'm running a DECstation 2100 with 8 Mb RAM and UWS 2.1.
On this I have 2 Maxtor LXT-213sy disk drives.  These drives are 3.5"
213 Mb disks which opperate in synchronous scsi.

When I execute "time dd if=/vmunix of=/dev/null bs=8k" I find that
I am only getting disk throughput of about 400k/second.  Kind of slow.
This is the same performance I was getting with non-sync drives.  I found
out about adding SCSI_TRYSYNC to the UNKNOWN entry in the scsi_data.c file
and rebuilt the kernel, but I still get the same 400k/second.  Will the
machine I have go any faster than this?  Will Ultrix 4.0 solve all my
problems?  I'm told that these disks are capable of better than 1Mb/second.
Will I ever see it on my machine?

Could someone who knows something about this please respond, I'm getting
desperate.

Thanks.