This article will show how to increase disk partition with fdisk then increase the related filesystem.
In this example, the partition is not used with lvm but the resize partition should also work for lvm.
In this article, you'll need :
- Oracle Linux 7 installed (see oel7 installation here)
- root access is needed
- the concerned filesystem declared in /etc/fstab (see here)
Careful ...
Please do a system and data backup before performing the steps on this article.
Recreate partition
We will delete and recreate th partition with fstab.
This will just modify table partition, so this will not delete any of your data if you do not overlap or shrink partitions.
# Make sure, it is in /etc/fstab
[root]$ cat /etc/fstab | grep u02
UUID=c739f00f-434f-478a-b80e-d761cbacac81 /u02 xfs defaults 1 2
# Unmount filesystem
[root]$ umount /u02
# Check disk before growing disk
[root]$ fdisk -l /dev/vdc
Disk /dev/vdc: 8589 MB, 8589934592 bytes, 16777216 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: 0xef23ac51
Device Boot Start End Blocks Id System
/dev/vdc1 2048 16777215 8387584 83 Linux
# Check disk after adding 8GB to disk
[root]$ fdisk -l /dev/vdc
Disk /dev/vdc: 17.2 GB, 17179869184 bytes, 33554432 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: 0xef23ac51
Device Boot Start End Blocks Id System
/dev/vdc1 2048 16777215 8387584 83 Linux
# Resize partition
[root]$ fdisk /dev/vdc
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): d
Selected partition 1
Partition 1 is deleted
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p):
Using default response p
Partition number (1-4, default 1):
First sector (2048-33554431, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-33554431, default 33554431):
Using default value 33554431
Partition 1 of type Linux and of size 16 GiB is set
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
# Check partition after resizing
[root]$ fdisk -l /dev/vdc
Disk /dev/vdc: 17.2 GB, 17179869184 bytes, 33554432 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: 0xef23ac51
Device Boot Start End Blocks Id System
/dev/vdc1 2048 33554431 16776192 83 Linux
Resize filesystem
After resizing disk partition, we can now resize the related filesystem.
# Mount filesystem first, if not
[root]$ mount /u02
# Check filesystem size before resizing
[root]$ df -h /u02
Filesystem Size Used Avail Use% Mounted on
/dev/vdc1 8,0G 1,1G 7,0G 14% /u02
# Resize filesystem (error)
[root]$ resize2fs /dev/vdc1
resize2fs 1.42.9 (28-Dec-2013)
resize2fs: Bad magic number in super-block while trying to open /dev/vdc1
Couldn't find valid filesystem superblock.
# We got this error because this is a xfs filesystem
# But the command above should work with extX filesystem
# Resize for xfs filesystem
[root]$ xfs_growfs -d /u02
meta-data=/dev/vdc1 isize=256 agcount=4, agsize=524224 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0 finobt=0
data = bsize=4096 blocks=2096896, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 2096896 to 4194048
# Check filesystem size after resizing
[root]$ df -h /u02
Filesystem Size Used Avail Use% Mounted on
/dev/vdc1 16G 1,1G 15G 7% /u02
HTH.
Please leave comments and suggestions,
Michel.
Reference
How to Resize a Partition using fdisk (redhat.com)
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