On Fri, Mar 02, 2007 at 03:01:53PM +0100, Luca Berra wrote: > On Thu, Mar 01, 2007 at 11:19:07PM +0000, Alasdair G Kergon wrote: > >On Thu, Mar 01, 2007 at 05:14:25PM -0500, Chris Hunter wrote: > >>Do I reallly need to make partition tables on all my disks to use lvm2 ? > > > >Other packages such as the installer like to have them. > > what about the fact that on many storage creating an ms-dos compatible > partition usually results in screwing io alignment? interesting. Although it comes as no surprise that the CHS boundaries are not aligned with the hardware anymore (like they were back in the days of say MFM), I thought that systems that attempted to use this level of information about a disk were fairly rare these days ? > Do _NOT_ use partitions, they are evil and should have been shot long > ago. :-) agreed, there are plenty of reasons to retire msdos partitions. What would you recommend as a setup for boot drives where the bios expects to boot from an msdos partition table (or more specifically the code at the begining of a sector with the magic of an msdos partitiontable) on sector 0 ? <reminisces ...> back in the days of around LVM 0.7 I patched my LVM to leave a blank sector at the front of the PV, in the much the same fashion as ext2, specifically so that I could format an entire boot disk in HM LVM. I found a number of "bugs" in the userspace tools which didn't account for variations in this variable, but were easy enough to fix up. As I recall, the author wasn't interested in such a modification, and warned against booting/swapping on LVM. one of the problems with this setup (apart from my learning at the time that you can patch your kernel so far, but eventually with enough patches it becomes a serious headache :-) was that grub didn't understand LVM and LILO wants blocks that don't move about, but there was no way to tell LVM to pin the relevant block in place (not that this was ever a problem in practice for me). One of the reasons I felt confident to do this was because I had read the kernel code, which was exceeding clear and simple. Of course that code has changed, and I have not kept up, and I have had one nasty LVM related event in the past few years (couldn't promise you that it wasn't operator error) and I am much more shy of putting swap and root on LVM than I was back then. Anyway, enough of that! </reminisces> Regards, Paddy _______________________________________________ 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/
