Can anyone tell-me what Filesystem can i use to format and use the shared LUN disk, in order to be used in 2 Blades with Debian Lenny?
The ideia is to get 2 apache nodes, using the same storage.
The Shared LUN just makes the (virtual) hardware available to both compute modules - it doesn't care what filesystem is on it.
It would be entirely up to the OS, as to what filesystems it supported.
This forum is more for Intel server hardware questions. There's certainly nothing preventing anyone here from helping you out with an OS question, of course; but you may have better results asking on one of the Debian forums out on the net, rather than here.