[lug] SW Raid question

[Zan Lynx]

On Tue, 2007-07-24 at 21:59 -0600, Lee Woodworth wrote:
> dio2002 at indra.com wrote:
[snip]
> > for my example, i intended to have lvm on top of a separate md raided root
> > partion.  and i am actually thinking about scrapping using lvm all
> > together.  not sure it really buys me much since my system is limited to 2
> > drives anyway.  and i wouldnt' be able to add an PVs.
> What LVM buys you is being able to grow a file system. Think about what it would
> take to grow your root fs. You can use LVM for the non-root fs file systems
> easily. A potential issue is in your distros start sequence relating to whether
> the raid tools get started before the lvm ones or vice-versa.

LVM also enables snapshots, which are the greatest thing since sliced
bread.

Note: LVM snapshots slow down your write performance, as each snapshot
gets a copy of the original disk block as it's overwritten.

Still worth it though, in my opinion.
-- 
Zan Lynx <zlynx at acm.org>
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