This guide was tested on CentOS 7 but should be in general applicable for other Linux distros with parted and LVM
WARN You can’t resize partitions on the running OS in CentOS 6 (unless you’re brave enough to mess with the
sfdisk) So the fastest option is to add new disk partition, create LVM PV from it and extend needed LVM VG accordingly Bad luck for you if you’re not using LVM ☠️
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Add required amount of space to the virtual machine disk
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Force Linux to rescan disk and load its new size - example for the /dev/sda and CentOS 7:
echo 1 > /sys/block/sda/device/rescan
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Check that free space is detected - example for the /dev/sda:
# Check free space parted /dev/sda print free # Example output: Model: VMware Virtual disk (scsi) Disk /dev/sda: 429GB Sector size (logical/physical): 512B/512B Partition Table: msdos Disk Flags: Number Start End Size Type File system Flags 32.3kB 1049kB 1016kB Free Space 1 1049kB 1075MB 1074MB primary xfs boot 2 1075MB 268GB 267GB primary lvm 268GB 429GB 161GB Free Space <<< DETECTED FREE SPACE
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Resize partition - in this example using all the free space (161GB or 150GiB) to resize
/dev/sda2:parted -a optimal /dev/sda resizepart 2 429GB
If you just need to resize a partition then you’re done, if you need to resize the LVM disk - see the next steps below.
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Resize LVM PV and check:
# Resize pvresize /dev/sda2 # Check pvs
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Resize LV and underlying FS (enabled by the option -r). Add 100GiB to the LV (leaving 50GiB free for the future usage) and check - example for the lv_data:
lvresize /dev/vg00/lv_data -r -L +100G # Check lvs
6a. Alternatively you can add all the available free space to the LV by doing so:
bash lvresize /dev/vg00/lv_data -r -l +100%FREE # Check lvs