Date: Thu, 16 May 2013 19:56:14 -0400 From: Zaphod Beeblebrox <zbeeble@gmail.com> To: Bob Bishop <rb@gid.co.uk> Cc: FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: tape (sa0) on sparc64 ? Message-ID: <CACpH0McOx_Kza-Ou-=ko724cehF0Kp3uhN%2B6mFy2L0GdLQ1ESg@mail.gmail.com> In-Reply-To: <0D672BB1-1928-4F7A-BF72-CA7EE15D0563@gid.co.uk> References: <CACpH0Mcass3ONxhFw5mRrQ1K931gxaxBZgo45_%2BynLrrbm4DUw@mail.gmail.com> <0D672BB1-1928-4F7A-BF72-CA7EE15D0563@gid.co.uk>
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On Thu, May 16, 2013 at 5:08 PM, Bob Bishop <rb@gid.co.uk> wrote: > 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 > Same result. Besides, as far as I understand, the proper operation (if the blocksize is too small) is to read the first $n bytes and then write them to the output.. But same result.
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