Date: Tue, 12 Mar 2002 19:46:20 +0900 From: "J. Hart" <jhart@atr.co.jp> To: aic7xxx@FreeBSD.ORG Cc: jhart@atr.co.jp Subject: file corruption on tape reload Message-ID: <3C8DDC7C.C8B6066B@atr.co.jp> References: <200203111629.g2BGTdI12625@aslan.scsiguy.com>
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I have been having difficulty making a good tape backup recently. I use
the following command to back up a directory :
tar cvM -f /dev/st0 2>&1 aminet | tee log
I reload that into a seperate directory using the following command :
tar xvM -f /dev/st0 2>&1 | tee log
When I compare the original with the reloaded backup, I find that one of
the files in the reloaded version is corrupted. It turns out that a contiguous
block of exactly 4096 bytes is corrupt. If I reload the same backup tapes
again, the corruption shows up at a different point in a different file, but the
corruption still involves a block of exactly 4096 bytes.
I had previously used this same tape drive on an older machine running
Slackware 4 and a stock kernel until very recently, and it worked perfectly
there. I am using the exact same model under RedHat 6.2 and the 2.2.16 kernel
on another machine, and that works perfectly. I have tried changing tapes and
cleaning the drive tape path, with no effect on the problem. I have also tried
upgrading the kernel to the most recent version available at the time (then
2.4.16) to no avail. I then tried rebuilding the kernel to use "aic7xxx_old"
support, also with no change in the problem. There is no indication of any
error in any of the logs I have checked (dmesg, /var/log/messages).
Does anyone have any idea on what I should be looking at here ?
My setup is as follows :
CPU : 900mhz Athlon
motherboard : ASYS-A7V
linux distribution : Slackware 8
kernel : 2.4.16
scsi controller : AHA-2940AU
scsi drivers tried : aic7xxx
: aic7xxx_old (after kernel rebuild)
hard disk : ATA100 IBM-DTLA-307045 45gb
tar version : tar (GNU tar) 1.13.25
tape drive:
Vendor: WangDAT Model: Model 3400DX Rev: 5.0d
Type: Sequential-Access ANSI SCSI revision: 02
Regards,
J. Hart
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