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Top Forums UNIX for Dummies Questions & Answers How to create a volume group, logical volume group and file system? Post 302770041 by zaxxon on Thursday 14th of February 2013 08:57:17 AM
Old 02-14-2013
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.
 

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VGDISPLAY(8)						      System Manager's Manual						      VGDISPLAY(8)

NAME
vgdisplay - display attributes of volume groups SYNOPSIS
vgdisplay [-A|--activevolumegroups] [-c|--colon] [-d|--debug] [-h|--help] [--ignorelockingfailure] [-P|--partial] [-s|--short] [-v[v]|--verbose [--verbose]] [--version] [VolumeGroupName...] DESCRIPTION
vgdisplay allows you to see the attributes of VolumeGroupName (or all volume groups if none is given) with it's physical and logical vol- umes and their sizes etc. vgs (8) is an alternative that provides the same information in the style of ps (1). OPTIONS
See lvm for common options. -A, --activevolumegroups Only select the active volume groups. -c, --colon Generate colon separated output for easier parsing in scripts or programs. N.B. vgs (8) provides considerably more control over the output. The values are: 1 volume group name 2 volume group access 3 volume group status 4 internal volume group number 5 maximum number of logical volumes 6 current number of logical volumes 7 open count of all logical volumes in this volume group 8 maximum logical volume size 9 maximum number of physical volumes 10 current number of physical volumes 11 actual number of physical volumes 12 size of volume group in kilobytes 13 physical extent size 14 total number of physical extents for this volume group 15 allocated number of physical extents for this volume group 16 free number of physical extents for this volume group 17 uuid of volume group -s, --short Give a short listing showing the existence of volume groups. -v, --verbose Display verbose information containing long listings of physical and logical volumes. If given twice, also display verbose runtime information of vgdisplay's activities. --version Display version and exit successfully. SEE ALSO
lvm(8), vgs(8), pvcreate(8), vgcreate(8), lvcreate(8) Sistina Software UK LVM TOOLS 2.02.44-cvs (02-17-09) VGDISPLAY(8)
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