http://docs.redhat.com/docs/en-US/Red_Hat_Storage/2/html/User_Guide/index.html If you go there, you will see that we mention XFS as a requirement. It doesn't mention anything about the 512byte inode size which I thought was a requirement. It also doesn't mention that users should be putting XFS on top of LVM. As I understand, going forward certain features such as snapshots won't work unless users are configured on LVM, so we should probably add that here and include some information that makes sure they configure it properly so that snapshots will work going forward.
I have added LVM as a requirement in Installation Guide and it is available at: http://documentation-stage.bne.redhat.com/docs/en-US/Red_Hat_Storage/2.0/html/Installation_Guide/chap-Installation_Guide-Test_Chapter.html#sect-Installation_Guide-gssa_prepare-prerequisites_1 inode - I have added a new section called "Formatting Bricks", included increasing inode size information and it is available at: http://documentation-stage.bne.redhat.com/docs/en-US/Red_Hat_Storage/2.0/html-single/Administration_Guide/index.html#id2659236
Verified in the links above.