Date: Thu, 16 May 2013 22:08:22 +0100 From: Bob Bishop <rb@gid.co.uk> To: Zaphod Beeblebrox <zbeeble@gmail.com> Cc: FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: tape (sa0) on sparc64 ? Message-ID: <0D672BB1-1928-4F7A-BF72-CA7EE15D0563@gid.co.uk> In-Reply-To: <CACpH0Mcass3ONxhFw5mRrQ1K931gxaxBZgo45_%2BynLrrbm4DUw@mail.gmail.com> References: <CACpH0Mcass3ONxhFw5mRrQ1K931gxaxBZgo45_%2BynLrrbm4DUw@mail.gmail.com>
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Hi, On 16 May 2013, at 21:51, Zaphod Beeblebrox wrote: > I have to retrieve some very old backups. They were made on FreeBSD and > are on tape... specifically DDS4. [etc] > However, attached to either controller (after a reboot of the machine and a > powercycle of the drive), I get: > > [1:25:325]root@run:/home/foo> dd if=/dev/sa0 of=tape5 > dd: /dev/sa0: Input/output error > 0+0 records in > 0+0 records out > 0 bytes transferred in 0.002930 secs (0 bytes/sec) > > ... which is a return code of '1' and no messages on the console... > > I have, before you ask, tried "bs=10k" and 20k ... but I believe this > command should run by itself fetching the first 512 bytes of each block --- > narrowing down the block size logically comes after making the tape go. Try bs=64k -- Bob Bishop rb@gid.co.uk
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