Date: Tue, 30 Mar 2004 09:39:33 -0600 From: Dan Nelson <dnelson@allantgroup.com> To: Jesse Guardiani <jesse@wingnet.net> Cc: freebsd-questions@freebsd.org Subject: Re: tcopy tape to tape WAY too slow Message-ID: <20040330153932.GE19463@dan.emsphone.com> In-Reply-To: <c4c00b$4ug$1@sea.gmane.org> References: <c4c00b$4ug$1@sea.gmane.org>
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In the last episode (Mar 30), Jesse Guardiani said: > I'm copying 35G/90G AIT-1 tapes on FreeBSD from tape drive to tape > drive (nrsa0 and nrsa1) using the tcopy -c command and it's taking > WAY too long. Over 12 hours including the verification process. (not > sure exactly how long as it finished when I was sleeping) > > Is there something I can do to speed this up? I don't think tcopy is double-buffered; if you only have one file on that tape and know the blocksize, dd if=/dev/nrsa0 bs=##k | dd of=/dev/nrsa0 bs=##k should be much faster. If you have multiple files or unknown blocksizes, the cptp command from the MAG package at http://www.cs.vu.nl/~dick/mag.html will preserve filemark and blocksize info through pipes, so you could do a cptp | cptp pipe. -- Dan Nelson dnelson@allantgroup.com
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