LVM 2 question

etcetera · 10-10-2023, 04:43 PM

Assuming I have a 900GB partition for the OS installed on a 2TB SSD.

How will I be able to add the extra space that will now become available to the Volume Group.

Since the source install is much less in size than the 2TB drive.

Or do I have to extend the partition first before expanding the volume group? With vgextend? Then lvextend. Because VG won't be aware of the extra disk space.

rknichols · 10-10-2023, 10:07 PM

Quote:

Originally Posted by etcetera

Or do I have to extend the partition first before expanding the volume group? With vgextend? Then lvextend. Because VG won't be aware of the extra disk space.

Close. After extending the partition, you want pvresize (with just the device name -- no other options needed), then lvextend.

The vgextend command is for adding more PVs (separate devices/partitions) to the VG. If you were adding a separate partition, then vgextend is what you would want. If you just enlarge the existing partition (adding space at the end, NOT at the beginning), then pvresize will detect the new size and adjust the PV parameters accordingly.

TB0ne · 10-11-2023, 08:15 AM

Quote:

Originally Posted by etcetera

Assuming I have a 900GB partition for the OS installed on a 2TB SSD. How will I be able to add the extra space that will now become available to the Volume Group. Since the source install is much less in size than the 2TB drive. Or do I have to extend the partition first before expanding the volume group? With vgextend? Then lvextend. Because VG won't be aware of the extra disk space.

Did you think about your other (almost identical) question regarding LVM shrinking, and how it would apply here?
https://www.linuxquestions.org/quest...m2-4175729496/

You got handed instructions and documentation, along with the exact command to use to resize an LVM. Try to apply that.