Re: Backup tools too slow for LTO-3

In article <g9idnco_wpXjI_nZnZ2dnUVZ_vSdnZ2d@xxxxxxxxxxxxx>,
Robert Lawhead <news0000.5.unixguru@xxxxxxxxxxxxxxx> wrote:

[4] star is a replacement for tar availabale at
http://cdrecord.berlios.de/old/private/star.html

You only need enough disk to buffer the difference between
the rates at which data is produced and consumed.

Write yourself a buffer program (think TIVO) that provides two
endpoints (named pipes stdin/stdout) that buffers its input to
a large "ring file". Manage the flow in and out of the ring
file such that reads on the read endpoint are blocked until
some high watermark is reached, but once reached will satisfy
reads until a low watermark (empty) is reached. At that point,
block reads until the ring is refilled to some high watermark
reached, and repeat...

Such a solution would be worse than what star already implements for a long
time.

With an external buffer program you will add the system load and overhead
of the needed pipe. Star uses built in shared memory to speed op the writes
_and_ reads from the filesystem.

--
EMail:joerg@xxxxxxxxxxxxxxxxxxxxxxxxxxx (home) Jörg Schilling D-13353 Berlin
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schilling@xxxxxxxxxxxxxxxxxxx (work) Blog: http://schily.blogspot.com/
URL: http://cdrecord.berlios.de/old/private/ ftp://ftp.berlios.de/pub/schily
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