Date: Tue, 3 Sep 2024 10:45:36 GMT From: Poul-Henning Kamp <phk@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: ffaf862df662 - main - Mention that SILI makes tcopy(1) slow on modern tape drives Message-ID: <202409031045.483AjagV044523@gitrepo.freebsd.org>
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The branch main has been updated by phk: URL: https://cgit.FreeBSD.org/src/commit/?id=ffaf862df662d507e8dd2667bffcba91e3745fe6 commit ffaf862df662d507e8dd2667bffcba91e3745fe6 Author: Poul-Henning Kamp <phk@FreeBSD.org> AuthorDate: 2024-09-03 10:44:20 +0000 Commit: Poul-Henning Kamp <phk@FreeBSD.org> CommitDate: 2024-09-03 10:44:20 +0000 Mention that SILI makes tcopy(1) slow on modern tape drives --- usr.bin/tcopy/tcopy.1 | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/usr.bin/tcopy/tcopy.1 b/usr.bin/tcopy/tcopy.1 index da6a5231a843..f608e0af07e4 100644 --- a/usr.bin/tcopy/tcopy.1 +++ b/usr.bin/tcopy/tcopy.1 @@ -97,6 +97,16 @@ command appeared in .Sh BUGS .Bl -item .It +Modern tape drives may return a SCSI "Incorrect Length Indicator (ILI)" +for reach read with a different block size that what is on the +tape, and that slows things down a lot. +This can be disabled with the +.Xr mt 1 +command: +.Bd -literal -offset indent +$ mt param sili -s 1 +.Ed +.It Writing 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
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