Date: Wed, 22 May 1996 11:39:09 +0200 (MET DST) From: "Georg-W. Koltermann" <gwk@racer.dkrz.de> To: freebsd-hackers@freebsd.org Subject: 960501-SNAP: data corruption reading /dev/rwt0 (Wangtek) Message-ID: <199605220939.LAA01849@racer.dkrz.de>
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The details are still a bit fuzzy, but maybe someone has seen this already and can give me a hint before I spend countless hours of hunting. Here is what I see: I got an old Wangtek QIC-150 tape device a couple of weeks ago, while still running 2.1.0-RELEASE on my old (386DX/40, 8MB) machine. It seemed to work flawlessly. One week ago I got a new PC (586/100, 32MB, ASUS T2P4), and tried to install 960501-SNAP from tape. Turned out most of the files read from tape were corrupted, so the installation would abort after unpacking one or two files of the first dist. I switched to the shell on VT4 and tried to untar the tape manually, then cat | zcat | cpio -itv to check if I could read the pieces. The tar finished without an error indication, but typically the zcat would abort readily, so I could only list a few files from the archive. I untarred the same tape a couple of times, trying different block sizes on the tar command. Eventually (using a blocking count of 16) I could read the tape without corruption, and could install the snap. Now with the snap loaded and running flawlessly, I want to read my backups from tape (cpio -H crc format), but again I am getting data corruption. When I look at the files extracted, they look fine up to a certain point where they just contain binary zeroes. I have again played with different block sizes for reading the tape, but this time I cannot find a block size that works. Different block sizes do move the point of corruption within the archive, however, so I can be quite sure the tape was written o. k.. Any ideas? Georg
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