From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-0.6 required=5.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE autolearn=ham autolearn_force=no version=3.4.2 Received: from minnie.tuhs.org (minnie.tuhs.org [45.79.103.53]) by inbox.vuxu.org (OpenSMTPD) with ESMTP id b0b94591 for ; Wed, 27 Nov 2019 20:43:48 +0000 (UTC) Received: by minnie.tuhs.org (Postfix, from userid 112) id ACCAF9B7B8; Thu, 28 Nov 2019 06:43:47 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 9E0A793D8C; Thu, 28 Nov 2019 06:43:13 +1000 (AEST) Authentication-Results: minnie.tuhs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=threedee.com header.i=@threedee.com header.b="pxRjHhN3"; dkim-atps=neutral Received: by minnie.tuhs.org (Postfix, from userid 112) id 448C393D8C; Thu, 28 Nov 2019 06:43:11 +1000 (AEST) X-Greylist: delayed 4170 seconds by postgrey-1.36 at minnie.tuhs.org; Thu, 28 Nov 2019 06:43:10 AEST Received: from uniform.gendns.com (uniform.gendns.com [198.105.219.4]) by minnie.tuhs.org (Postfix) with ESMTPS id 9644693D59 for ; Thu, 28 Nov 2019 06:43:10 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=threedee.com; s=default; h=Content-Type:Mime-Version:References:In-Reply-To :Subject:From:To:Date:Sender:Reply-To:Message-ID:Cc:Content-Transfer-Encoding :Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=yRElc35ar2BRdG3KWI8NQXKu9yo84dQc0Q0qNYtICQM=; b=pxRjHhN3zPQxMIo3Tevv7T8pbr msytGjjsCXcfElkqT0TfTOafrDq8TYyqkfMU8dpdN54hvt0tGU8k2Plm7frQ9uISmk/RtVcsKivIz Xn7gSZzdETfjvK8UxurYpfV3ZdOEb43WAVokUR2ieFWbkWyWN1BsCAg6uHB6in2C44usVR1zeTKXp XQqgN7+sGeQ2/Nd1qnBwwfZQICYLd+GjZAY2qy6bqbIN0coCzY67VpcxKYpiJIE9U2XxYIc6d78WT +29qEdCpa1JkjZUMvBETlyg/gv2Vq7bvtZX2m7kRIYddTJ1L7ocaO06hVehdHcN1B1ot5dGXcm5Jg Jv9PKxpg==; Received: from 24-159-239-218.static.mdsn.wi.charter.com ([24.159.239.218]:62052 helo=ALBA.threedee.com) by uniform.gendns.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.92) (envelope-from ) id 1ia348-006rhY-Nv for tuhs@minnie.tuhs.org; Wed, 27 Nov 2019 14:33:38 -0500 X-Mailer: QUALCOMM Windows Eudora Version 7.1.0.9 Date: Wed, 27 Nov 2019 13:31:11 -0600 To: TUHS main list From: John Foust In-Reply-To: <20191124225239.GG18200@mcvoy.com> References: <20191124225239.GG18200@mcvoy.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" X-OutGoing-Spam-Status: No, score=5.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - uniform.gendns.com X-AntiAbuse: Original Domain - minnie.tuhs.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - threedee.com X-Get-Message-Sender-Via: uniform.gendns.com: authenticated_id: jfoust@threedee.com X-Authenticated-Sender: uniform.gendns.com: jfoust@threedee.com X-Source: X-Source-Args: X-Source-Dir: Message-Id: <20191127204311.448C393D8C@minnie.tuhs.org> Subject: Re: [TUHS] Someone wants to use an exabyte X-BeenThere: tuhs@minnie.tuhs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: The Unix Heritage Society mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" At 04:52 PM 11/24/2019, Larry McVoy wrote: >Good luck with that. I had a 4/470 that had an exabyte, wheeled it out of >building 5 at Sun and into building 9 at SGI and the tapes wouldn't read >back. I jumped in on that Twitter thread when I saw it. Two years ago or so, I attempted to read a couple dozen old backup tapes from the mid 1990s. Half were Archive Python DDS-2 era, written on two different drives that I still had, as 'tar' tapes from SGI workstations. The other half were Exabyte 8500 8mm, some 'tar' from SGI and Linux and Amiga, some Windows NTBACKUP. I set up a fresh Linux box with an Adaptec SCSI card. I couldn't get any of the DDS-2 to read, either on the original hardware that wrote them, or on a newer STD28000N drive I bought on eBay, a pull from an old Apple server. I could write new tapes on the drive, just couldn't read any old ones. My attempts included reading some tapes I know I'd received from other people (that is, written on other drives) that I know I had been able to read on this hardware back in the day. They wouldn't read, either. On the other hand, I could read the majority of the Exabytes, even on the original drive I had retained, as well as another I'd bought used in the early 2000s. Some had bad blocks here and there. The tougher task was trying to find contemporary tools that could process the data stream from an old NTBACKUP, especially a stream with corruption from missing chunks, as I wasn't in the mood to try to rebuild an NT machine with SCSI to let NTBACKUP deal with the drive directly, and I think it would probably fail harder on direct drive errors. The Amiga-made 'tar' archives were readable by 'tar' but the file time stamps weren't right when burst under Linux. I didn't debug that yet. - John