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lvresize doesn't work when shrinking filesystems if a similiar named LV is mounted

Solution Verified - Updated 2015-02-08T02:36:10+00:00 -

Issue

If /dev/vg00/lv_fs2 is mounted I am not able to shrink /dev/vg00/lv_fs with lvresize -L <new size> -r /dev/vg00/lv_fs. This command fails with Do you want to unmount "<Mountpoint of lv_fs2>"? [Y|n] and will not shrink the volume.

Environment

Red Hat Enterprise Linux 5/6

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