On Thursday 11 January 2007 13:35, hendrik@topoi.pooq.com wrote: > Are there any partitioning tools that happily deal in LVM on RAID? > > parter, gparted, fdisk, cfdisk seem not to, as least fron what > documentation I've managed to find for them. The nature of your question suggests that you don't really understand how LVM works. Here is a quick primer and some links: When using LVM, you first need Physical Volues (PVs). These are real partitions or drives. Some examples would be /dev/hda2 or /dev/sdb. To use a device as a physical volume, you typically just run pvcreate on it; in general, you also set it to an "LVM" type partition using fdisk and friends, but this isn't strictly necessary. Anyway, it will destroy any existing data on each partition or device you use for a PV. Setting up PVs is the ONLY time you'll ever use a program like fdisk or parted. For the rest, you use LVM tools. After you've created PVs, you will not ever use them directly. Instead, you group them together into a Volume Group (VG). A VG has a symbolic name you give to a group of PVs. You create one with vgcreate, e.g. if I wanted to create a VG called "vgmain" using two PVs I'd created previously, I might run "vgcreate vgmain /dev/hda2 /dev/sdb". You can also add and remove PVs on-the-fly later. *Finally*, you need to create Logic Volumes, which is the whole point of an LVM system (that's why it's *Logical Volume Management*). These are the actual volumes that you treat like you used to treat partitions, e.g. put file systems on them. You create LVs as part of a Volume Group that you've previously created, and give them symbolic names. You can add, remove, and resize them using lv* commands. For instance, if I wanted a 500M LV named "opt", I might run "lvcreate -n opt -L500M vgmain". Now I'd probably make a filesystem on it with "mkfs.ext3 /dev/vgmain/opt" and put a line in my fstab like "/dev/vgmain/opt /opt ext3 defaults 0 0". Later, I might add or remove more LVs, resize them, etc. I can do all of the online, although obviously the data itself on the LV (e.g. a filesystem) may need to be unmounted and/or resized first, although most filesystems can at least GROW online, while mounted. Anyway, see <http://tldp.org/HOWTO/LVM-HOWTO/> for a more in depth discussion. You can pretty much ignore anything that talks about "LVM1" unless you're working with a legacy system. There are also other systems like EVMS, but LVM2 is pretty much the mainstream. -- Wesley J. Landaker <wjl@icecavern.net> <xmpp:wjl@icecavern.net> OpenPGP FP: 4135 2A3B 4726 ACC5 9094 0097 F0A9 8A4C 4CD6 E3D2
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