I was stating that it's the way you'd want to do that. Doing otherwise would be bad. :) On Wed, 2002-01-30 at 11:48, Kirby C. Bohling wrote: > Austin, > > Just as an aside, I have done all of those configurations with > no LVM > involved. RAID0+1, RAID1+0, and RAID5 on top of mirrored devices. Yes > RAID1+0 isn't very smart, but we did it. It is much simpiler, and more > reliable to have RAID underneath LVM. Not because LVM is unreliable, > but if you forget, or don't realize both halves of a mirror got migrated > > to the same disks your mirror might be a lot less redundant then you > believe it is. Wow, I just restated the a FAQ entry in a very poor > manner... > > LVM didn't try to be all incompassing. It could have been, but > it would > have made things more complicated and duplicated a bunch of work from > what I have read on this list. > > Kirby > > > Austin Gonyou wrote: > > I can think of MANY uses for this. The main one would be a relatively > > cheap way of making a RAID0+1, or stripe of mirrors. If you don't have > > any hardware to do this with, then software is next. It'd be nice to > be > > able to do this, for sure. You could even do 0+5, or something crazy > > like that too. > > > > > > On Tue, 2002-01-29 at 17:50, Kirby C. Bohling wrote: > > > >>Paul, > >> > >> I haven't done it. I have done mirrors underneath, but I am > >>curious what > >>is the reasoning and/or application. The only thing I can think up is > > >>so you can migrate your mirrors to faster drives easily. However, > >>putting the mirror underneath should allow you to move off one mirror > >>onto another. > >> > >> I don't believe that mirroring can be expanded like a filesystem > >>can. In > >>order to make the mirror bigger, you have to break the mirror as far > as > >>I know. So what are you planning on doing with it, or is it just "to > >>see if it could be done". > >> > >> Thanks, > >> Kirby > >> > >>lvm@agilecat.mailshell.com wrote: > >> > >>>Hi all, > >>> > >>>I understand the use of LVM over software RAID. > >>>But is it possible to use software RAID ON TOP > >>>of LVM? For example, have a RAID-1 mirroring > >>>array created from two logical volumes. > >>> > >>>I've tried and it seems to be working. Is > >>>it safe to do this? Any pitfalls? > >>> > >>>Thanks! > >>> > >>>Paul > >>> > >>>_______________________________________________________ > >>>The FREE service that prevents junk email http://www.mailshell.com > >>> > >>>_______________________________________________ > >>>linux-lvm mailing list > >>>linux-lvm@sistina.com > >>>http://lists.sistina.com/mailman/listinfo/linux-lvm > >>>read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html > >>> > >>> > >> > >> > >>_______________________________________________ > >>linux-lvm mailing list > >>linux-lvm@sistina.com > >>http://lists.sistina.com/mailman/listinfo/linux-lvm > >>read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html > >> > > > > _______________________________________________ > linux-lvm mailing list > linux-lvm@sistina.com > http://lists.sistina.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html -- Austin Gonyou Systems Architect, CCNA Coremetrics, Inc. Phone: 512-698-7250 email: austin@coremetrics.com "It is the part of a good shepherd to shear his flock, not to skin it." Latin Proverb
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