Apparently, though unproven, at 12:48 on Saturday 09 April 2011, Dale did opine thusly:
> > the new drive ready for LVM. What command adds it to the VG? Is it > > vgcreate with some option? I was sort of looking for something like > > vgadd or something but no luck finding that. Maybe I am missing it on > > the howtos. > > > > Dale > > > > :-) :-) > > That would be vgextend wouldn't it? I just read another bit in another > howto. Yes. PVs, VGs, LVs all have a concept of extend|resize|reduce. What that means depends on what you are working with, but they all make the thing bigger or smaller. For a PV it means the underlying device's size changed, so the PV must change to match. Take a 500G drive, create 1 partition on it of 100G and make it a PV. Now enlarge the partition to 200G, you must extend the PV to match. A VG isn't a single thing, it's a collection of things. Extending it means to add more PVs, reducing it means to take PVs out of the VG. Hopefully you will always remember to migrate the data off a PV before removing it from a VG :-) Extend/Reduce an LV means to make the device larger/smaller. It is exactly the same thing as changing a partition size using fdisk. Obviously, you need to tweak the filesystem at the same time -- alan dot mckinnon at gmail dot com
