| Date: Fri, 19 Jul 2002 16:15:49 +0100
| From: Brian Foster <blf@utvinternet.ie>
|[ ... ]
|  the issue here is tar(1) (and cpio(1)) archives always
|  contain the data for each name of a hard link.  [ ... ]
ARRGGGHHHH!!!!!
profuse apologies, the wrong version of my reply was posted
(blame it on being late for the pub).  ;-(
the above is almost pure B*S* --- I got my `tar's and `cpio's
confused.  what I said _is_ correct, but for cpio(1) archives;
tar(1) archives do _not_ replicate the data for hard links.
I spotted this confusion on my part before I posted my reply,
and re-wrote it to be more correct, yet somehow the wrong
version got sent anyways.  ARRGGGHHHH!!!!!  ;-(  ;-(  ;-(
anyways, GNU `cpio -p' does not do spurious reads or writes.
GNU `tar cf - ... | tar xf - ...' also does not, albeit each
`tar' both reads and writes the data.  hence, there is twice
(not thrice!) the I/O of `cpio -p', maybe an issue for c.60Gb.
using strace(1), I've verified my claim GNU `cpio -p' does
not do spurious reads or writes, i.e. it link(2)s.  but having
just come back from the pub, perhaps this should also be taken
with extra skepticism ......   ;-\
sorry.  cheers!
-blf-
--
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Re: [ILUG] hard- vs. soft-links [was: How to copy some files ]
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