hi room

I try to increasing Displaying Logical Volumes from 2 TB to 7 TB when df -h following show

Filesystem Size Used Avail Use% Mounted on
/dev/sda5 20G 514M 18G 3% /
/dev/sda8 16G 224K 16G 1% /dev/shm
/dev/sda1 9.5G 93M 9.0G 2% /boot
/dev/sdb1 1.9T 67M 1.8T 1% /disk/data1
/dev/sdb2 1.9T 67M 1.8T 1% /disk/data2
/dev/sda2 29G 45M 28G 1% /home
/dev/sda3 29G 327M 27G 2% /opt
/dev/sda9 4.7G 174M 4.3G 4% /tmp
/dev/sda6 20G 5.0G 14G 28% /usr
/dev/sda10 4.7G 1.3G 3.3G 28% /var
tmpfs 16G 224K 16G 1% /dev/shm
[lnxmatlab]# fdisk -l /dev/sdb

Disk /dev/sdb: 15998.8 GB, 15998753177600 bytes
255 heads, 63 sectors/track, 1945070 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000abb9c

Device Boot Start End Blocks Id System
/dev/sdb1 1 254965 2048000000 83 Linux
/dev/sdb2 254965 509929 2048000000 83 Linux

see i have to in crease from 2 TB to 7 TB more but lvextend -L7000G /dev/sdb1
lvextend -L7000G /dev/sdb1
Path required for Logical Volume "sdb1".
Please provide a volume group name
Run `lvextend --help' for more information.

please help

Your are not using LVM so you do not have any logical volumes.
The disk is partitioned using legacy MBR so the largest partition size is 2TB.

You can reformat the disk using GPT and then create an LVM partition with logical volumes sizes of your choice or create 2 separate 7TB partitions.

Do you know how?

thank you

What distribution / version are you running

i am using redhat 6.7

Have you read the RHEL Storage Admin and LVM guides ?.

You can use the parted command:

http://www.thegeekstuff.com/2012/08/2tb-gtp-parted/

Please use code tags for your output, much easier to read.

I'm really confused on what you are trying to do, as well as "Hi Room."

On one hand you say your trying to use LVM, however you use fdisk to display /dev/sdb1. If your using large partitions, you shouldn't be using fdisk. Also those partitions are only formatted with file type 83, when if you want to use LVM, it should be filetype 8e for Linux LVM.

If your using LVM, show us output of the following commands: