From owner-freebsd-scsi@FreeBSD.ORG Mon Jun 2 11:11:42 2003 Return-Path: Delivered-To: freebsd-scsi@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 70F1A37B404 for ; Mon, 2 Jun 2003 11:11:42 -0700 (PDT) Received: from beppo.feral.com (beppo.feral.com [192.67.166.79]) by mx1.FreeBSD.org (Postfix) with ESMTP id C8BCA43F93 for ; Mon, 2 Jun 2003 11:11:41 -0700 (PDT) (envelope-from mjacob@feral.com) Received: from mailhost.feral.com (mjacob@mailhost.feral.com [192.67.166.1]) by beppo.feral.com (8.12.9/8.12.9) with ESMTP id h52IBeqw071574; Mon, 2 Jun 2003 11:11:40 -0700 (PDT) (envelope-from mjacob@feral.com) Date: Mon, 2 Jun 2003 11:11:40 -0700 (PDT) From: Matthew Jacob X-X-Sender: mjacob@beppo To: Dan Langille In-Reply-To: <3EDB59A4.27599.C93270FB@localhost> Message-ID: <20030602110836.H71034@beppo> References: <3EDB31AB.16420.C8964B7D@localhost> <3EDB59A4.27599.C93270FB@localhost> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII cc: freebsd-scsi@freebsd.org cc: Kern Sibbald Subject: Re: SCSI tape data loss X-BeenThere: freebsd-scsi@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list Reply-To: mjacob@feral.com List-Id: SCSI subsystem List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 02 Jun 2003 18:11:42 -0000 > And we have finish: > > ./tpt -v -b 5120 -r 10000000000 -n 10 -f /dev/nrsa0 > .......Rewind Tape > ........Write Pass > WEOT at File 0 Record 694983 Offset 0 (3558312960 total bytes written) > Elapsed Seconds: 5467; Data Rate: 0.620633MB/s > .......Rewind Tape > .........Read Pass > REOT at File 1 Record 0 Offset 0 (3558312960 total bytes read) > Elapsed Seconds: 4422: Data Rate: 0.7673MB/s > -- Now, tape_pattern_tester actually does some somewhat simplistic data integrity checking, so I tend to believe that the bytes read do match the bytes written. This now begs the question as to why Bacula lost some records. I'm going to ponder this a bit today while I'm at one of my paying gigs. I'll hook up a tape drive to a FreeBSD box @ Feral tomorrow and see if I can anylyze Bacula a bit closer. -matt