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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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