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Date:      Tue, 21 Dec 1999 12:40:13 +1100
From:      Peter Jeremy <peter.jeremy@alcatel.com.au>
To:        Matthew Dillon <dillon@apollo.backplane.com>, Greg Lehey <grog@lemis.com>
Cc:        FreeBSD current users <FreeBSD-current@FreeBSD.ORG>
Subject:   Re: Recent current hangs frequently for 1 to 2 seconds.
Message-ID:  <99Dec21.123129est.40326@border.alcanet.com.au>
In-Reply-To: <199912210108.RAA62736@apollo.backplane.com>; from dillon@apollo.backplane.com on Tue, Dec 21, 1999 at 12:08:27PM %2B1100
References:  <19991219143759.C465@freebie.lemis.com> <199912190416.UAA01125@apollo.backplane.com> <19991221095213.L440@freebie.lemis.com> <199912210019.QAA62510@apollo.backplane.com> <19991221110148.N440@freebie.lemis.com> <199912210108.RAA62736@apollo.backplane.com>

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On 1999-Dec-21 12:08:27 +1100, Matthew Dillon <dillon@apollo.backplane.com> wrote:
>    Tape drives may:
>    * Not support disconnection ...
>    * Implement a crappy SCSI command stack ...
>    * Not properly terminate the SCSI bus ...
>    * Introduce too much noise onto the SCSI bus due to bad design.

Do modern drives still support these various `features'?  I know
there used to be problems, but I thought Greg was using a (presumably
fairly recent) DLT drive.  Given the normal data rates associated with
DLT drives, I would have thought they would behave fairly well.

BTW, since Greg mentioned he was thinking of using an AHA-1542B -
I've found that mine won't work in sync mode.  Whenever I tried to
read or write, it would just timeout, until I disabled SYNC.  (And
if I increased the sync speed beyond 5MHz, the kernel would usually
panic).

Peter


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