[linux-lvm] LVM performance

[Bradley M Alexander]

On Fri, Nov 23, 2001 at 05:32:07PM +1300, Steve Wray wrote:
> 
> thats dead right; ide can't simultaneously write to the master and slave
> on the same controller. Also, the pair of drives uses the controller
> circuitry
> of the master, so it always pays to make the master the most modern one.

Since both controllers have a drive master and a cd slave, this shouldn't
matter, per se.

> 
> > Can anyone give me any ideas as to why the machine gets beaten about so
> > much during IO operations and more importantly how can I minimize the
> > impact.
> 
> Dunno, if it was because the fs is striped across those drives then
> splitting them across controllers would have made it go away.

Nothing should be striped across the drives. I have two PVs and made two
VGs, one on each drive. The way it works out, the data I am mastering is on
vg01 (hdc), and the ISO is being created there as well. the CD write actually
happens from hdc -> hdd.

> I've seen no performance problems at all and really thrashed an LVM-root
> machine for test purposes while working on a movie. It took it well,
> performance-wise. (reliability is another issue; never go LVM-root...
> but thats just my 2 cents, YMMV).

Yeah, I wasn't brave enough to go all out...And with the problems I was
having, I'm glad I made that decision. :)

> 
> 
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> read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html

-- 
--Brad
============================================================================
Bradley M. Alexander, CISSP              |   Co-Chairman,
Beowulf System Admin/Security Specialist |    NoVALUG/DCLUG Security SIG
Debian/GNU Linux Developer		 |   storm at debian.org
                                         |   storm at tux.org
============================================================================
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experience. The trick is to fill the bag of experience before you
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