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author | phk <phk@FreeBSD.org> | 1999-04-30 13:13:32 +0000 |
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committer | phk <phk@FreeBSD.org> | 1999-04-30 13:13:32 +0000 |
commit | ca402ccf60ff298de9082838079fbbea0c315f01 (patch) | |
tree | 966de84d1239eda328387c22dc2096862aa6a585 /usr.bin/tcopy/tcopy.1 | |
parent | 6f402caa86e0c6c0c2fc853ea9f38902b9f85f30 (diff) | |
download | FreeBSD-src-ca402ccf60ff298de9082838079fbbea0c315f01.zip FreeBSD-src-ca402ccf60ff298de9082838079fbbea0c315f01.tar.gz |
Tcopy uses 32 bit unsigned to accumulate a count of bytes read/written.
That doesn't work well for tapes over 4G.
I use tcopy a lot to write images of a tape to tape as tape to tape
copying is terribly slow. Slower than it should be. Quickly found out
tcopy can not rewind a file when doing copy/verify.
PR: 11386
Submitted by: David Kelly dkelly@hiwaay.net
Reviewed by: phk
Diffstat (limited to 'usr.bin/tcopy/tcopy.1')
-rw-r--r-- | usr.bin/tcopy/tcopy.1 | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/usr.bin/tcopy/tcopy.1 b/usr.bin/tcopy/tcopy.1 index 32cf748..d201073 100644 --- a/usr.bin/tcopy/tcopy.1 +++ b/usr.bin/tcopy/tcopy.1 @@ -87,3 +87,19 @@ The .Nm command appeared in .Bx 4.3 . +.Sh BUGS +Writting an image of a tape to a file does not preserve much more than +the raw data. Block size(s) and tape EOF marks are lost which would +otherwise be preserved in a tape-to-tape copy. + +EOD is determined by two sequential EOF marks with no data between. +There are old systems which typically wrote three EOF's between tape +files. +.Xr tcopy 1 +will erroneously stop copying early in this case. + +When using the copy/verify option \-c +.Xr tcopy 1 +does not rewind the tapes prior to start. A rewind is performed +after writing prior to the verification stage. If one doesn't start +at BOT then the comparison may not be of the intended data. |