| 1 |
Apparently, though unproven, at 12:48 on Saturday 09 April 2011, Dale did |
| 2 |
opine thusly: |
| 3 |
|
| 4 |
> > the new drive ready for LVM. What command adds it to the VG? Is it |
| 5 |
> > vgcreate with some option? I was sort of looking for something like |
| 6 |
> > vgadd or something but no luck finding that. Maybe I am missing it on |
| 7 |
> > the howtos. |
| 8 |
> > |
| 9 |
> > Dale |
| 10 |
> > |
| 11 |
> > :-) :-) |
| 12 |
> |
| 13 |
> That would be vgextend wouldn't it? I just read another bit in another |
| 14 |
> howto. |
| 15 |
|
| 16 |
Yes. |
| 17 |
|
| 18 |
PVs, VGs, LVs all have a concept of extend|resize|reduce. What that means |
| 19 |
depends on what you are working with, but they all make the thing bigger or |
| 20 |
smaller. |
| 21 |
|
| 22 |
For a PV it means the underlying device's size changed, so the PV must change |
| 23 |
to match. Take a 500G drive, create 1 partition on it of 100G and make it a |
| 24 |
PV. Now enlarge the partition to 200G, you must extend the PV to match. |
| 25 |
|
| 26 |
A VG isn't a single thing, it's a collection of things. Extending it means to |
| 27 |
add more PVs, reducing it means to take PVs out of the VG. Hopefully you will |
| 28 |
always remember to migrate the data off a PV before removing it from a VG :-) |
| 29 |
|
| 30 |
Extend/Reduce an LV means to make the device larger/smaller. It is exactly the |
| 31 |
same thing as changing a partition size using fdisk. Obviously, you need to |
| 32 |
tweak the filesystem at the same time |
| 33 |
|
| 34 |
-- |
| 35 |
alan dot mckinnon at gmail dot com |
Archives