How to add volumes to an Oracle LInux OS server

Oracle Linux 6 or 7 . I'm trying to clear up my misconception about adding volumes to a Linux box.

When i was a sysadmin as well as a dba, to add disc space to a server i used LVM. I seem to remember being able to extend whatever space i had added if necessary. I don't recall what the backend was. But it was fairly simple. i used pvcreate to create the volumes then added them using lmv.

Now where i work we don't have access to that. The sysadmin gives out the space.

The backend is netapps. The space is added as nfs with ip addresse:volumename in the file system name name or ocfs (?). where it is mounted with /dev/xvdf1  as the file system name then the mounted on /u01 or whereever.. I can see this with a df -h command.