--reduce : option needs to be developed

[achede22]

Reduce swap, xfs or ext4 Logical Volume feature is under development and rarely needed.

[achede22]

https://blog.dbi-services.com/how-to-reduce-the-size-a-lvm-partition-formatted-with-xfs-filesystem-on-centos7/

Bad news! we cannot reduce an xfs partition directly so we need:
– to backup our filesystem
– umount the filsesytem && delete the logical volume
– re-partition tle logical volume with xfs FS
– restore our data

[achede22]

Red Hat Enterprise Linux 7

A RFE was placed to request the ability to shrink a XFS filesystem in RHEL 7 in the following Red Hat Bugzilla

Bug 1062667 - [RFE] Add ability to shrink XFS filesystems

-- This RFE is CLOSED as WONTFIX.
-- There are no plans to implement shrink on XFS. If filesystem shrinking capability is required, ext4 has that feature.

Workarounds
--In some cases, the following workarounds may be acceptable:
--- Use thin provisioned LVM volumes below the XFS filesystem.
--- Use some backup / restore solution, such as xfsdump / xfsrestore. This may be useful especially if the filesystem is mostly empty.

Causa Raíz
-- While the XFS file systems can be grown while mounted, their size cannot be reduced. This feature has been discussed on the upstream xfs mailing lists for over 10 years, but the feature is deemed to be complex and risky, and limited critical use cases are believed to exist.