> But I thought that the purpose of LVM was to make a number of partitions > look like one big one. So I can understand that with an added volume group, > the filsesystems are separate, but for my (2) below, I expected all LVM-type > partitions to seen as one large one. The purpose of LVM is to make a bunch of physical drives look like one big pool of storage space. A Volume Group is a container into which you plug physical volumes (drives) so that the logical volumes can allocate space from the pool (volume group) as needed. > 1) Why would you want several logical volumes in one volume group? The same reason(s) you would want to partition a regular hard drive. Maybe you only want /home to have 20GB so your kids can't flood the computer with downloaded music. Maybe you want /var/www to have restricted permissions so your home web server is less vulnerable to hackers. Maybe you're running a PVR application like MythTV and want a high-performance filesystem like XFS for storing recorded shows. All of these can be done with logical volumes, and are often easier under LVM. > 2) Why would you want several volume groups at all? You don't need multiple volume groups on a single machine. There are certain uses though in which it is beneficial, usually in commercial use. -- Drew "Nothing in life is to be feared. It is only to be understood." --Marie Curie _______________________________________________ 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/
