> From: linux-lvm-admin@sistina.com [mailto:linux-lvm-admin@sistina.com]On > Behalf Of 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. yeah but I thought I'd mention it, for completeness :) > > > 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 yup you have to tell it to stripe, as I recall. Never used that feature tho. > > 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. :) I think the worst part is the lack of backward compatibility at some stages of LVM. With root on LVM it can be a bit dangerous to upgrade! Or at least it was...
