On Fri, Jun 05, 2009 at 10:00:00AM +0200, Marian Csontos wrote: > Zhengquan Zhang wrote: >> On Wed, Jun 03, 2009 at 02:42:29PM -0400, Stuart D. Gathman wrote: >> >>> On Wed, 3 Jun 2009, Zhengquan Zhang wrote: >>> >>> >>>> For one harddrive I often create a /boot parition that is not lvm and >>>> create a huge partition on the rest of the harddrive for PV of lvm. Now >>>> I am thinking what is the difference between doing partition like this >>>> and just a single big partition without lvm? >>>> >>> With LVM, you can create many logical volumes. If you only ever create one >>> logical volume that fills the entire PV, and you aren't spanning drives >>> (multiple PVs) or mirroring, then LVM is not doing anything for you. >>> > Not at the moment, but the moment you run out of space and decide to add > another drive, it will save you a lot of trouble moving all your > partitions around... Sounds great and definetely I will exploit this feature in the future. >> That is what I am doing, so I am not fully utilizing lvm. another >> question, is it advisable to create on pv for one harddrive? >> >> > Yes, it is the right way. Having 2 PVs on single drive offer no benefit > I can think of, and actually it is a step back - you can not share "free > space" between PVs, thus it is a way to simulate old fashioned > partitions. Thanks for confirming. >>> Even with just one LV, leave some space for a snapshot. Then you can >>> take more consistent backups by creating a snapshot of your main LV >>> and backing that up instead. Put your swap space in LVM as well. >>> >> >> Thanks for pointing out this. I never thought of leaving space for >> snapshot. and the swap too, why it is good to put swap in lvm? >> >> > I think most of installers do not think of it neither (unless you > partition you disk yourself, which is not so difficult, but may be a bit > scary for newbies) - I would like an install option "leave N% of created > PV free and use only the rest now". Yeah, that would be great, for some installer I guess there are expert mode which enables you to do more manipulation. Thanks, Marian, -- Zhengquan _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
