Comments on: How to Reduce LVM Partition Size in RHEL and CentOS

By: Bill

Bill — Sun, 15 May 2022 00:02:10 +0000

The command I was looking for is pvresize. That allows your to resize an lvm parttion.

By: Bill

Bill — Thu, 12 May 2022 12:27:09 +0000

Thanks, but this is directions on how to reduce the size of a logical volume, not a partition (e.g. a physical volume).
BTW. If you want to don’t want the volume unmounted you can create a snapshot, and use that while reducing the partition size. Only you need enough free space in your group so you can allocate the snapshot to have enough space to for the changing of the file system. But with USB sticks of 256G or greater being easily affordable, it is quite practical to put some physical volumes on a USB stick for your snapshot volume.

By: Hasniuj

Hasniuj — Fri, 20 Nov 2020 11:25:23 +0000

I am trying to reduce root partition size. It’s showing below error:

“on-line resizing required resize2fs: On-line shrinking not supported”

By: Pradeep Kumar

Pradeep Kumar — Tue, 10 Mar 2020 03:02:24 +0000

In reply to Lucas. In the production environment, it is not recommended to reduce files system as it might lead to file system corruption and data destruction but there are some situation where we need to reduce it. So in Step:4 we will not loose any data as file system usage is 9.2 GB and we are reducing it from 12 GB to 10 GB and before reduction we are doing files system check with e2fsck command and resizing it with resize2fs command and in last we are reducing the file system.

By: Lucas

Lucas — Mon, 09 Mar 2020 15:04:11 +0000

Hi, good post!

One question, in step 4 it says “WARNING: Reducing active logical volume to 10.00 GiB
THIS MAY DESTROY YOUR DATA (filesystem etc.)”. So it means that the data in /home are destroyed while de resize is performed?

By: Alfredo

Alfredo — Fri, 12 Apr 2019 17:15:49 +0000

Thank you so much!!!

By: Pradeep Kumar

Pradeep Kumar — Wed, 28 Feb 2018 02:18:14 +0000

In reply to Guruchandran. There are chances that your file system might get corrupted if you don't umount file system during lvm reduce.

By: Guruchandran

Guruchandran — Tue, 27 Feb 2018 06:51:47 +0000

Why have to unmount the file system takes place before reduce size of lvm

By: Pradeep Kumar

Pradeep Kumar — Fri, 24 Nov 2017 15:29:58 +0000

During LVM reduction, It is always recommended to umount file system otherwise there can be corruption on the file system, though you try reducing the LVM partition online without umounting.

By: Abhishek

Abhishek — Fri, 24 Nov 2017 14:51:51 +0000

Thanks for the article. Is there no way to reduce Linux file system without unmounting i.e. to avoid downtime ?