This guide will explain how to grow an XFS filesystem once you’ve increased in the underlying storage.
If you’re on a VMware machine, have a look at this guide to increase the block device, partition and LVM volume first: Increase A VMware Disk Size (VMDK) Formatted As Linux LVM without rebooting. Once you reach the resize2fs command, return here, as that only applies to EXT2/3/4.
To see the info of your block device, use xfs_info.
$ xfs_info /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=256 agcount=4, agsize=1210880 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0
data = bsize=4096 blocks=4843520, 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
Once the volume group/logical volume has been extended (see this guide for increasing lvm), you can expand the partition using xfs_growfs.
$ xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=256 agcount=4, agsize=1210880 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0
data = bsize=4096 blocks=4843520, 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
The increase will happen in near-realtime and probably won’t take more than a few seconds.
Using just xfs_growfs, the filesystem will be increased to its maximum available size. If you want to only increase for a couple of blocks, use the -D option.
If you don’t see any increase in disksize using df, check this guide: Df command in Linux not updating actual diskspace, wrong data.