There are several steps involved in extending the hard drive.
- Check the current disk usage
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/rhel-root 46G 6.3G 39G 14% /
devtmpfs 12G 0 12G 0% /dev
tmpfs 12G 0 12G 0% /dev/shm
tmpfs 12G 13M 12G 1% /run
tmpfs 12G 0 12G 0% /sys/fs/cgroup
/dev/sda1 1014M 200M 815M 20% /boot
tmpfs 2.4G 12K 2.4G 1% /run/user/988
tmpfs 2.4G 0 2.4G 0% /run/user/0
- Use fdisk command for creating and manipulating disk partition table
# fdisk -l
Disk /dev/sda: 96.6 GB, 96636764160 bytes, 188743680 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000bf21d
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 104857599 51379200 8e Linux LVM
Disk /dev/mapper/rhel-root: 48.4 GB, 48444211200 bytes, 94617600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/mapper/rhel-swap: 4160 MB, 4160749568 bytes, 8126464 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
- # fdisk /dev/sda
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): n
Partition type:
p primary (2 primary, 0 extended, 2 free)
e extended
Select (default p): p
Partition number (3,4, default 3):
First sector (104857600-188743679, default 104857600):
Using default value 104857600
Last sector, +sectors or +size{K,M,G} (104857600-188743679, default 188743679):
Using default value 188743679
Partition 3 of type Linux and of size 40 GiB is set
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.
- # partprobe
- # pvscan
PV /dev/sda2 VG rhel lvm2 [<49.00 GiB / 4.00 MiB free] Total: 1 [<49.00 GiB] / in use: 1 [<49.00 GiB] / in no VG: 0 [0 ]
- vgextend rhel /dev/sda3
Physical volume "/dev/sda3" successfully created. Volume group "rhel" successfully extended
- pvscan
PV /dev/sda2 VG rhel lvm2 [<49.00 GiB / 4.00 MiB free]
PV /dev/sda3 VG rhel lvm2 [<40.00 GiB / <40.00 GiB free]
Total: 2 [88.99 GiB] / in use: 2 [88.99 GiB] / in no VG: 0 [0 ]
- # lvdisplay
--- Logical volume ---
LV Path /dev/rhel/swap
LV Name swap
VG Name rhel
LV UUID hGgz4r-7jFf-oHZz-eJWs-RBtb-3RqQ-DS0wYA
LV Write Access read/write
LV Creation host, time rhel76.lab.opentext.com, 2019-01-22 15:23:44 +0530
LV Status available
# open 2
LV Size <3.88 GiB
Current LE 992
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:1
--- Logical volume ---
LV Path /dev/rhel/root
LV Name root
VG Name rhel
LV UUID beJf86-1F0L-eu8J-suwq-ItZg-Z4qv-spCLf9
LV Write Access read/write
LV Creation host, time rhel76.lab.opentext.com, 2019-01-22 15:23:44 +0530
LV Status available
# open 1
LV Size <45.12 GiB
Current LE 11550
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0
- # xfs_growfs /dev/rhel/root
meta-data=/dev/mapper/rhel-root isize=512 agcount=4, agsize=2956800 blks = sectsz=512 attr=2, projid32bit=1 = crc=1 finobt=0 spinodes=0 data = bsize=4096 blocks=11827200, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=1 log =internal bsize=4096 blocks=5775, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0
- # pvscan
PV /dev/sda2 VG rhel lvm2 [<49.00 GiB / 4.00 MiB free]
PV /dev/sda3 VG rhel lvm2 [<40.00 GiB / <40.00 GiB free]
Total: 2 [88.99 GiB] / in use: 2 [88.99 GiB] / in no VG: 0 [0 ]
- # lvextend /dev/rhel/root /dev/sda3
Size of logical volume rhel/root changed from <45.12 GiB (11550 extents) to 85.11 GiB (21789 extents). Logical volume rhel/root successfully resized.
- # xfs_growfs /dev/rhel/root
meta-data=/dev/mapper/rhel-root isize=512 agcount=4, agsize=2956800 blks = sectsz=512 attr=2, projid32bit=1 = crc=1 finobt=0 spinodes=0 data = bsize=4096 blocks=11827200, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=1 log =internal bsize=4096 blocks=5775, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 data blocks changed from 11827200 to 22311936
- # df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/rhel-root 86G 6.3G 79G 8% /
devtmpfs 12G 0 12G 0% /dev
tmpfs 12G 0 12G 0% /dev/shm
tmpfs 12G 13M 12G 1% /run
tmpfs 12G 0 12G 0% /sys/fs/cgroup
/dev/sda1 1014M 200M 815M 20% /boot
tmpfs 2.4G 12K 2.4G 1% /run/user/988
tmpfs 2.4G 0 2.4G 0% /run/user/0
Now observe that available hard disk is increased from 39 GB to 79 GB
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