LVM Reducing LVs Without Data Loss
 

I am trying to move space around on my server but am getting some warnings like the following that are keeping me from proceeding:

[/os_images]# lvreduce -L 19G /dev/VolGroup00/backuplv
WARNING: Reducing active logical volume to 19.00 GB
THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce backuplv? [y/n]:


I have unmounted the filesystem /backup so I am not sure why the warning says the logical volume is still active. Is there a way to unactivate the logical volume? Is there a way to reduce an LVM filesystem with 100% assurance that there won't be data corruption? And finally, is there a way to shrink a mounted/online filesystem without the risk of data loss?

Thank you whoever helps!

Check the LV in /etc/lvm/lvm.conf (typically). Path and filename may be slightly different, but that should at least get you on the right track. Make sure the LV is inactive there.

Solved
 

I was able to get this to work by unmounting the filesystem and using "system-config-lvm". I was really trying to do this at the command line and some experts I trust said I could use the lvreduce or lvresize command and ignore the warning message as long as I was sure the resize2fs command was succssful.

Awesome. Sounds like your all good to go. Yeah, there's always more than one way to go about most things, it all just depends on which one works the best :P.