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Date: Thu, 29 Feb 1996 16:21:38 -0700
From: Nate Williams <nate@sri.MT.net>
Message-Id: <199602292321.QAA13183@rocky.sri.MT.net>
To: tomppa@fidata.fi
Cc: questions@freebsd.org
Subject: Re: Backup problem
In-Reply-To: <199602292125.XAA02246@zeta.fidata.fi>
References: <199602292125.XAA02246@zeta.fidata.fi>
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> My system hangs when I'm doing full backup to DAT drive with tar or
> cpio.
...
> it takes 5-55 minutes before it happens.
....

> I changed bt driver to aha (AMI SCSI controller is compatible with
> buslogic 742a and Adaptec 1542). With aha driver backupping works like
> a charm. Making full backup taked over an hour but it worked
> smoothly. I even tried it twice. Any good explanations?

Yep, I'll bet the bounce buffer code is enabled on the aha driver and
might not be on the buslogic.

>  > real memory  = 33554432 (32768K bytes)

This is important if you have more than 16MB and your card can't do DMA
above 16MB.

>  > bt0: Bt747S/ 0-(32bit) bus

The bt driver assumes it can.


Nate