[CentOS] Mirroring Hard Drive

Amos Shapira amos.shapira at gmail.com
Mon Dec 8 07:55:42 UTC 2008


2008/12/8 William L. Maltby <CentOS4Bill at triad.rr.com>:
> Yep. I've recently began using rsync for several types of "local" copy,
> usually back-up related. I can't recall if the "cp -a" detects and
> handles hard-links to minimize space requirements though. I know cpio

Yes, it seems that "cp -a" is designed just for that kind of job.
Might have to add "-x" to limit it to one file system if you are
interested.

I noticed that, to my surprise, rsync is sometimes faster than a plain
scp even when the destination is empty, and as someone else said it's
nice to be able to stop/start and redo.

> can/does. I guess I'll have to read up on cp some more and see if it
> leaves the access times alone (cpio parameter allows retaining that) and
> handles hard-links efficiently.

I'm not sure why you should care about atime so much - more and more
people around (including Linus Torvalds) recommend to get rid of it
altogether. Ubunut comes with "relatime" as a default config already.

According to Linus, disabling atime updates will give the single
largest performance gain (in dozens of percentages, as far as I
remember).

But back to the question - am I missing something too by not using
dump/restore or cpio? dump/restore is so BSD 4/'80's :)

Cheers,

--Amos


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