Hi All,

I have a 500GB SAN Disk provisioned to my RHEL 5.6 64bit box . It will host some DBMS . Now as per the requirement I need to create multiple VG's in the SAN disk (/dev/sdb1) with different VG size, So here is what I did ,

#pvcreate /dev/sdb1

Now I need to create a VG named stg for 4096m size , whatever option I use I end up creating a VG which utilizes the whole PV size of 500G , please let me know whether we have a way to define the VG size , I know that there is a way to do it (Alas , can't find how) as a similar server has custom set VG sizes in a single LUN,

Also to note , EMC Power path or any other multipathing software isn't installed in the server

Thanks,

creates a "volume group" as a collection of physical devices (which may be simply partitions).
You can specify the extent size, the unit of size which can be used to create "logical volumes" but you can't specify the volume group size.

You maybe confusing logical volumes and volume groups.
You may create one large volume group that has lots of space, then allocate the space needed by creating logical volumes
using lvcreate, which takes size as an arg.

Also, you may create your partitions in small units, then create a volume group as a collection of partitions, which you can add to, or remove from.

If you insist on having a 4096M VG, then
Create /dev/sdb1 to be 4096M
and your VG vgname will be 4096M

You'll still have to create a logical volume, and in the end it will be slightly less than 4096M of usable space because of metadata.