From owner-freebsd-current Mon Dec 20 17:40:28 1999 Delivered-To: freebsd-current@freebsd.org Received: from alcanet.com.au (border.alcanet.com.au [203.62.196.10]) by hub.freebsd.org (Postfix) with ESMTP id 1687C153C7 for ; Mon, 20 Dec 1999 17:40:24 -0800 (PST) (envelope-from jeremyp@gsmx07.alcatel.com.au) Received: by border.alcanet.com.au id <40326>; Tue, 21 Dec 1999 12:31:29 +1100 Content-return: prohibited Date: Tue, 21 Dec 1999 12:40:13 +1100 From: Peter Jeremy Subject: Re: Recent current hangs frequently for 1 to 2 seconds. In-reply-to: <199912210108.RAA62736@apollo.backplane.com>; from dillon@apollo.backplane.com on Tue, Dec 21, 1999 at 12:08:27PM +1100 To: Matthew Dillon , Greg Lehey Cc: FreeBSD current users Message-Id: <99Dec21.123129est.40326@border.alcanet.com.au> MIME-version: 1.0 X-Mailer: Mutt 1.0i Content-type: text/plain; charset=us-ascii 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> Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On 1999-Dec-21 12:08:27 +1100, Matthew Dillon 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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message