Guy,
'tar -R' does list the block# where a file starts (effectively an index).
You then forward to the file-mark of your file and therein you seek to
the desired block#. Other archiving tools also do this (e.g. afio which
I prefer).
I used a script that automatically greps the tar listing to extract this
info and extract the desired file from the tape. A few minues is all it
took.
But I use disks for backup these days...
cheers
Guy Watkins wrote:
} -----Original Message-----
} From: linux-raid-owner@xxxxxxxxxxxxxxx [mailto:linux-raid-
} owner@xxxxxxxxxxxxxxx] On Behalf Of Thomas Fjellstrom
} Sent: Sunday, October 25, 2009 1:26 AM
} To: linux-raid@xxxxxxxxxxxxxxx
} Subject: Re: Is My Data DESTROYED?!
}
} On Sat October 24 2009, Leslie Rhorer wrote:
[trim]
} Wouldn't you use some 'tar' like format on the tape so there's a file
} index
} you can search without having to scan the entire tape? Then you can just
} "ffwd" (seek) to the position. _should_ be lots faster than reading all of
} the
} data from the beginning to the files location trying to find it. Or maybe
} there's something I'm missing about tapes?
tar does not have an index. The file name comes just before the file. I
use cpio and gzip. But I write to a USB disk. I have restored 1 file, and
it had to scan through the data to find the file.
[trim]
--
Eyal Lebedinsky (eyal@xxxxxxxxxxxxxx)
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