fdisk /dev/sdb

   create as many partitions as you need using command n

   Label them with command t as 8e for making it Linux LVM

   Write and Exit with the command w.

Format the partitions you require using mkfs command

   mkfs -t ext3 -c /dev/sdb1

LVM commands

   pvcreate /dev/sdb1

   vgextend VolGroup00 /dev/sdb1

   lvextend -L 15G /dev/VolGroup00/LogVol01 ;for extending LogVol to 15GB

   lvextend -L+1G /dev/VolGroup00/LogVol01 ;for adding one more GB to Logical Volume LogVol01

   ext2online or resize2fs /dev/VolGroup00/LogVol01 ;for resizing the Logical Volumes