From owner-freebsd-current Thu Dec 26 10:14:20 1996 Return-Path: Received: (from root@localhost) by freefall.freebsd.org (8.8.4/8.8.4) id KAA01106 for current-outgoing; Thu, 26 Dec 1996 10:14:20 -0800 (PST) Received: from hauki.clinet.fi (root@hauki.clinet.fi [194.100.0.1]) by freefall.freebsd.org (8.8.4/8.8.4) with ESMTP id KAA01100 for ; Thu, 26 Dec 1996 10:14:12 -0800 (PST) Received: from cantina.clinet.fi (root@cantina.clinet.fi [194.100.0.15]) by hauki.clinet.fi (8.8.2/8.6.4) with ESMTP id UAA00542; Thu, 26 Dec 1996 20:14:03 +0200 (EET) Received: (hsu@localhost) by cantina.clinet.fi (8.8.4/8.6.4) id UAA03704; Thu, 26 Dec 1996 20:14:02 +0200 (EET) Date: Thu, 26 Dec 1996 20:14:02 +0200 (EET) Message-Id: <199612261814.UAA03704@cantina.clinet.fi> From: Heikki Suonsivu To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) Cc: freebsd-current@freebsd.org In-reply-to: J Wunsch's message of 24 Dec 1996 10:06:00 +0200 Subject: Re: DAT: reading with blocksize=256K Organization: Clinet Ltd, Espoo, Finland References: <199612240747.IAA10234@uriah.heep.sax.de> Sender: owner-current@freebsd.org X-Loop: FreeBSD.org Precedence: bulk In article <199612240747.IAA10234@uriah.heep.sax.de> J Wunsch writes: > I just got a DAT cartridge with a tar backup. It seems that the backup > was made with a blocksize of 256K. Isn't it possible to get the data into > my pc with current (it looks like there's a limit of 64K)?? This has been discussed at lenth already: it's currently limited by physio(9) to chunks of at most 64 KB size, due to the limitations in the scatter/gather list of some SCSI controllers that don't allow for more than 16 scatter/gather segments. I have been able to read my old backups written with 1024k blocksize. They secret was to use ddd instead of dd. Not debugger interface ddd, but the old streaming dd by jtv@hut.fi, it is available somewhere in nic.funet.fi, and I think team might be similar. I do not know what happens. ddd certainly does not do anything smart. -- Heikki Suonsivu, T{ysikuu 10 C 83/02210 Espoo/FINLAND, hsu@clinet.fi mobile +358-40-5519679 work +358-9-43542270 fax -4555276