[linux-lvm] lvm and 'poor mans raid' on heterogenous hard drives!

[Rupa Schomaker]

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Andreas Dilger <adilger at turbolabs.com> writes:

> Swap is a bad move, since you can just add multiple swap spaces with the
> same priority (if you so choose) and it will do the striping for you.
> Likewise, you could put each of the above trees on their own drive and
> you would probably get better overall performance than striping.

This suggestion has always bothered me.  Yes, if all you care about
performance, setting up swap this way works fine.  However, for every
drive you add you increase the likelyhood that you're system will fail
due to a drive failure (what happens when one of the swap slices
suddenly dissapears?).

The better (IMO) suggestion is to use MD to setup RAID-1 mirrors and
then swapadd those.  That way, if one of your drives go south, you
still have a workable swap.

- -- 
- -rupa

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