[root@partitioning ~]# lsblk
loop0 7:0 0 3.6G 1 loop /mnt/iso
sda 8:0 0 20G 0 disk
├─sda1 8:1 0 300M 0 part /boot
└─sda2 8:2 0 17.7G 0 part /
sr0 11:0 1 1024M 0 rom
[root@partitioning ~]# fdisk -l
Disk /dev/sda: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 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: 0x0009149c
Device Boot Start End Blocks Id System
/dev/sda1 * 1 39 307200 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 39 2350 18566144 83 Linux
[root@partitioning ~]# df -hT
Filesystem Type Size Used Avail Use% Mounted on
/dev/sda2 ext4 18G 6.8G 9.8G 41% /
tmpfs tmpfs 358M 0 358M 0% /dev/shm
/dev/sda1 ext4 283M 75M 194M 28% /boot
/root/rhel-server-6.7-x86_64-dvd.iso
iso9660 3.6G 3.6G 0 100% /mnt/iso
[root@partitioning ~]# fdisk /dev/sda
WARNING: DOS-compatible mode is deprecated. It’s strongly recommended to
switch off the mode (command ‘c’) and change display units to
sectors (command ‘u’).
Command (m for help): p
Disk /dev/sda: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 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: 0x0009149c
Device Boot Start End Blocks Id System
/dev/sda1 * 1 39 307200 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 39 2350 18566144 83 Linux
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 3
First cylinder (2350-2610, default 2350):
Using default value 2350
Last cylinder, +cylinders or +size{K,M,G} (2350-2610, default 2610): +100M
Command (m for help): p
Disk /dev/sda: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 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: 0x0009149c
Device Boot Start End Blocks Id System
/dev/sda1 * 1 39 307200 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 39 2350 18566144 83 Linux
/dev/sda3 2350 2363 106429+ 83 Linux
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.
[root@partitioning ~]# partprobe
Warning: WARNING: the kernel failed to re-read the partition table on /dev/sda (Device or resource busy). As a result, it may not reflect all of your changes until after reboot.
[root@partitioning ~]# fdisk -l
Disk /dev/sda: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 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: 0x0009149c
Device Boot Start End Blocks Id System
/dev/sda1 * 1 39 307200 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 39 2350 18566144 83 Linux
/dev/sda3 2350 2363 106429+ 83 Linux
[root@partitioning ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 3.6G 1 loop /mnt/iso
sda 8:0 0 20G 0 disk
├─sda1 8:1 0 300M 0 part /boot
└─sda2 8:2 0 17.7G 0 part /
sr0 11:0 1 1024M 0 rom
[root@partitioning ~]# reboot
Broadcast message from root@partitioning
(/dev/pts/0) at 6:33 …
The system is going down for reboot NOW!
[root@partitioning ~]# Connection to 172.16.28.170 closed by remote host.
Connection to 172.16.28.170 closed.
mohammedrafi@NOC-RAFI:~$ ssh root@172.16.28.170
root@172.16.28.170’s password:
Last login: Sat Mar 26 06:25:25 2016 from 172.16.28.1
[root@partitioning ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 3.6G 1 loop /mnt/iso
sda 8:0 0 20G 0 disk
├─sda1 8:1 0 300M 0 part /boot
├─sda2 8:2 0 17.7G 0 part /
└─sda3 8:3 0 104M 0 part
sr0 11:0 1 1024M 0 rom
[root@partitioning ~]# fdisk /dev/sda
WARNING: DOS-compatible mode is deprecated. It’s strongly recommended to
switch off the mode (command ‘c’) and change display units to
sectors (command ‘u’).
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): t
Partition number (1-4): 3
Hex code (type L to list codes): L
0 Empty 24 NEC DOS 81 Minix / old Lin bf Solaris
1 FAT12 39 Plan 9 82 Linux swap / So c1 DRDOS/sec (FAT-
2 XENIX root 3c PartitionMagic 83 Linux c4 DRDOS/sec (FAT-
3 XENIX usr 40 Venix 80286 84 OS/2 hidden C: c6 DRDOS/sec (FAT-
4 FAT16 <32M 41 PPC PReP Boot 85 Linux extended c7 Syrinx
5 Extended 42 SFS 86 NTFS volume set da Non-FS data
6 FAT16 4d QNX4.x 87 NTFS volume set db CP/M / CTOS / .
7 HPFS/NTFS 4e QNX4.x 2nd part 88 Linux plaintext de Dell Utility
8 AIX 4f QNX4.x 3rd part 8e Linux LVM df BootIt
9 AIX bootable 50 OnTrack DM 93 Amoeba e1 DOS access
a OS/2 Boot Manag 51 OnTrack DM6 Aux 94 Amoeba BBT e3 DOS R/O
b W95 FAT32 52 CP/M 9f BSD/OS e4 SpeedStor
c W95 FAT32 (LBA) 53 OnTrack DM6 Aux a0 IBM Thinkpad hi eb BeOS fs
e W95 FAT16 (LBA) 54 OnTrackDM6 a5 FreeBSD ee GPT
f W95 Ext’d (LBA) 55 EZ-Drive a6 OpenBSD ef EFI (FAT-12/16/
10 OPUS 56 Golden Bow a7 NeXTSTEP f0 Linux/PA-RISC b
11 Hidden FAT12 5c Priam Edisk a8 Darwin UFS f1 SpeedStor
12 Compaq diagnost 61 SpeedStor a9 NetBSD f4 SpeedStor
14 Hidden FAT16 ❤ 63 GNU HURD or Sys ab Darwin boot f2 DOS secondary
16 Hidden FAT16 64 Novell Netware af HFS / HFS+ fb VMware VMFS
17 Hidden HPFS/NTF 65 Novell Netware b7 BSDI fs fc VMware VMKCORE
18 AST SmartSleep 70 DiskSecure Mult b8 BSDI swap fd Linux raid auto
1b Hidden W95 FAT3 75 PC/IX bb Boot Wizard hid fe LANstep
1c Hidden W95 FAT3 80 Old Minix be Solaris boot ff BBT
1e Hidden W95 FAT1
Hex code (type L to list codes): 82
Changed system type of partition 3 to 82 (Linux swap / Solaris)
Command (m for help): p
Disk /dev/sda: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 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: 0x0009149c
Device Boot Start End Blocks Id System
/dev/sda1 * 1 39 307200 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 39 2350 18566144 83 Linux
/dev/sda3 2350 2363 106429+ 82 Linux swap / Solaris
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.
[root@partitioning ~]# partprobe
Warning: WARNING: the kernel failed to re-read the partition table on /dev/sda (Device or resource busy). As a result, it may not reflect all of your changes until after reboot.
[root@partitioning ~]# fdisk -l
Disk /dev/sda: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 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: 0x0009149c
Device Boot Start End Blocks Id System
/dev/sda1 * 1 39 307200 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 39 2350 18566144 83 Linux
/dev/sda3 2350 2363 106429+ 82 Linux swap / Solaris
[root@partitioning ~]# swapon -s
Filename Type Size Used Priority
[root@partitioning ~]# swapon -a
swapon: /dev/sda3: swapon failed: Invalid argument
[root@partitioning ~]# mkswap /dev/sda3
Setting up swapspace version 1, size = 106424 KiB
no label, UUID=3b85701e-f66d-40ac-a6e6-d7c2ac9dd3dd
[root@partitioning ~]# swapon -s
Filename Type Size Used Priority
[root@partitioning ~]# swapon /dev/sda3
[root@partitioning ~]# swapon -s
Filename Type Size Used Priority
/dev/sda3 partition 106424 0 -1
/dev/sda3 swap swap defaults 0 0
or we can use UUID=3b85701e-f66d-40ac-a6e6-d7c2ac9dd3dd instead of /dev/sda3
[root@partitioning ~]# cat /etc/fstab
#
# /etc/fstab
# Created by anaconda on Sat Oct 24 05:43:58 2015
#
# Accessible filesystems, by reference, are maintained under ‘/dev/disk’
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=d74ee9d4-00d3-42d7-b4aa-494f88ddf74a / ext4 defaults 1 1
UUID=5402dab1-f174-41e1-a3f8-ad386c26924c /boot ext4 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
/root/rhel-server-6.7-x86_64-dvd.iso /mnt/iso iso9660 loop,ro 0 0
/dev/sda3 swap swap defaults 0 0
[root@partitioning ~]# mount -a
[root@partitioning ~]# swapon -a
[root@partitioning ~]# swapon -s
Filename Type Size Used Priority
/dev/sda3 partition 106424 0 -1
WARNING: DOS-compatible mode is deprecated. It’s strongly recommended to
switch off the mode (command ‘c’) and change display units to
sectors (command ‘u’).
Command (m for help): p
Disk /dev/sda: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 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: 0x0009149c
Device Boot Start End Blocks Id System
/dev/sda1 * 1 39 307200 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 39 2350 18566144 83 Linux
/dev/sda3 2350 2363 106429+ 82 Linux swap / Solaris
Command (m for help): n
Command action
e extended
p primary partition (1-4)
4
Invalid partition number for type `4′
Command action
e extended
p primary partition (1-4)
e
Selected partition 4
First cylinder (2364-2610, default 2364):
Using default value 2364
Last cylinder, +cylinders or +size{K,M,G} (2364-2610, default 2610):
Using default value 2610
Command (m for help): p
Disk /dev/sda: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 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: 0x0009149c
Device Boot Start End Blocks Id System
/dev/sda1 * 1 39 307200 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 39 2350 18566144 83 Linux
/dev/sda3 2350 2363 106429+ 82 Linux swap / Solaris
/dev/sda4 2364 2610 1984027+ 5 Extended
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.
[root@partitioning ~]# partprobe
Warning: WARNING: the kernel failed to re-read the partition table on /dev/sda (Device or resource busy). As a result, it may not reflect all of your changes until after reboot.
[root@partitioning ~]#
[root@partitioning ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 3.6G 1 loop /mnt/iso
sda 8:0 0 20G 0 disk
├─sda1 8:1 0 300M 0 part /boot
├─sda2 8:2 0 17.7G 0 part /
└─sda3 8:3 0 104M 0 part [SWAP]
sr0 11:0 1 1024M 0 rom
[root@partitioning ~]# fdisk -l
Disk /dev/sda: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 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: 0x0009149c
Device Boot Start End Blocks Id System
/dev/sda1 * 1 39 307200 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 39 2350 18566144 83 Linux
/dev/sda3 2350 2363 106429+ 82 Linux swap / Solaris
/dev/sda4 2364 2610 1984027+ 5 Extended
[root@partitioning ~]# partprobe
Warning: WARNING: the kernel failed to re-read the partition table on /dev/sda (Device or resource busy). As a result, it may not reflect all of your changes until after reboot.
Broadcast message from root@partitioning
(/dev/pts/0) at 7:09 …
The system is going down for reboot NOW!
[root@partitioning ~]# Connection to 172.16.28.170 closed by remote host.
Connection to 172.16.28.170 closed.
mohammedrafi@NOC-RAFI:~$ ssh root@172.16.28.170
root@172.16.28.170’s password:
Last login: Sat Mar 26 06:51:00 2016 from 172.16.28.1
[root@partitioning ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 3.6G 1 loop /mnt/iso
sda 8:0 0 20G 0 disk
├─sda1 8:1 0 300M 0 part /boot
├─sda2 8:2 0 17.7G 0 part /
├─sda3 8:3 0 104M 0 part [SWAP]
└─sda4 8:4 0 1K 0 part
sr0 11:0 1 1024M 0 rom
linuxmadeeasy 