Unable to create logical volume snapshot

Hi All,
Pls note that the follwoing error is reported when a snapshot is being created  in our Oracle Linux Server release 5.11 box:
[root@hawaii901 tmp]# lvcreate --size 500m --name snap /dev/ora_vg/vol02
  Volume group name expected (no slash)
  Run `lvcreate --help' for more information.
Any clue on this issue?
Thanks & Regards

LVM snapshot is a general purpose solution that was not designed with Oracle database in mind. It can be used, for example, to quickly create a snapshot prior to a system upgrade, then if you are satisfied with the result, you would delete the snaphot.
There is probably a common misconception. LVM snapshots, like all COW snapshosts that I'm aware off, allow to create a backup of a live filesystem while changes are written to the snapshot volume. Hence it's called "copy on write", or copy on change if you want. This is necessary for system integrity to make a complete backup of all data in a LVM volume at a certain point in time and to allow changes happening while the filesystem backup is taking place. A snapshot is no substitute for a disaster recovery backup in case you loose your storage media. A snapshot only takes seconds, and initially does not copy or backup any data, unless data changes. It is therefore important to delete the snapshot if no longer required, in order to prevent duplication of data and restore file system performance.
If snapshot or COW technololgy suits your purpose, you will actually want to look into BTRFS filesystem, which is more modern, employs the idea of subvolumes and is much more efficient that LVM.

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