Adding Harddisk on RHEL5

[root@localhost ~]# fdisk -l

Disk /dev/sda: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1           6       48163+  83  Linux
/dev/sda2               7         515     4088542+  83  Linux
/dev/sda3             516         776     2096482+  82  Linux swap / Solaris
/dev/sda4             777        1305     4249192+   5  Extended
/dev/sda5             777        1305     4249161   83  Linux

Disk /dev/sdb: 7516 MB, 7516192768 bytes
255 heads, 63 sectors/track, 913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sdb doesn't contain a valid partition table
[root@localhost ~]# fdisk /dev/sdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

Command (m for help): m
Command action
   a   toggle a bootable flag
   b   edit bsd disklabel
   c   toggle the dos compatibility flag
   d   delete a partition
   l   list known partition types
   m   print this menu
   n   add a new partition
   o   create a new empty DOS partition table
   p   print the partition table
   q   quit without saving changes
   s   create a new empty Sun disklabel
   t   change a partition's system id
   u   change display/entry units
   v   verify the partition table
   w   write table to disk and exit
   x   extra functionality (experts only)

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-913, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-913, default 913):
Using default value 913

Command (m for help): p

Disk /dev/sdb: 7516 MB, 7516192768 bytes
255 heads, 63 sectors/track, 913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1         913     7333641   83  Linux

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

[root@localhost ~]# mount -t ext3 /dev/sdb1 /u01

[root@nav1 ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda2             3.8G  1.9G  1.7G  53% /
/dev/sda5             4.0G  137M  3.6G   4% /home
/dev/sda1              46M   11M   33M  24% /boot
tmpfs                 506M     0  506M   0% /dev/shm
/dev/sdb1             6.9G  144M  6.4G   3% /u01

For mounting permanently add the entry in the fstab file in "/etc" location as below

[root@nav1 ~]# cat /etc/fstab
LABEL=/                 /                       ext3    defaults        1 1
LABEL=/home             /home                   ext3    defaults        1 2
LABEL=/boot             /boot                   ext3    defaults        1 2
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
LABEL=SWAP-sda3         swap                    swap    defaults        0 0
/dev/sdb1               /u01                    ext3    defaults        0 0

Regards,
Navaneeth