How do I use "realtime subvolume" for storing video data?

[hank peng]

Hi, folks:
I am using XFS in storing video suvillence data, and today I found
"realtime subvolume" feature on SGI website. I used to make xfs with
default parameters, but I think this feature is maybe very useful to
me.
SGI website said: XFS supports the notion of a "realtime subvolume" -
a separate area of disk space where only file data is stored.  This is
really what I need, since disk space become biger and biger nowerdays,
if some sectors are corrupted, video data is lost which is acceptable
but the whole XFS filesystem down is not acceptable.

I googled some information, but it seems that few people made use of
this feature. I wonder if it is usable in my case and how do I use it?

-- 
The simplest is not all best but the best is surely the simplest!