I assume you are talking about AIX LVM?
If this is the case, you should have a look in here:
IBM Info Center
The maximum number of Physical Partitions (PP) per Physical Volume (PV) is 1016. So if your 200 GB belong to one PV, you should have at least a PP size of 256 MB to use all space on it. You can do the maths yourself.
In short, the concept is:
PV --- VG (parted into PPs) --- LV (related to LP) --- FS
PPs are related with LPs. When you have a mirrored LV for example, you usually have 2 PPs that backup 1 LP. Best choice is to have both PPs on different PVs of course.
- A PV can be any kind of disk, local, SAN LUN, whatever.
- A PV can not belong to more than one VG.
- A VG can have more than one PV but at least 1.
- A VG can have more than one LV.
- A FS needs a LV beneath. A FS is related 1:1 with a LV
- There are types of LVs that do not need a FS on top, like Raw-LVs etc.
02-14-2013
How to create a volume group, logical volume group and file system?
