debian lenny stability, reliability, xen, drbd?

Hi,

I am thinking about an OpenSSI two nodes cluster with mirrored disks
between the nodes, probably using drbd. I need an uptodate desktop
environment, and high availability.


I would like to know how stable and reliable is the OpenSSI for lenny.
Seeing that it is being kept in the directory called alpha got me a bit
worried, since I would like this server to operate without an admin
babysitting it.

Also, my hardware has a network interface that has a driver only in the
latest 2.6.26 kernel, so it probably means that I would have to
recompile the kernel for that driver, or could I just install a XEN on
the two nodes and run OpenSSI as guest(?) In which case I may also be
able to live migrate one of the nodes to the other node for hardware
maintenance. Or would the RAM pose a problem in that scenario? (i.e.
the first guest will take up all the ram of the machine, so there will
be no ram space to migrate the second one in.)

In XEN , can I replicate the whole OS via drbd, ie have both nodes boot
from the same filesystem?

Since drbd is of version 7 in openssi does it not support
primary/primary or is it a special version that does?

And what about the CFS? say if I put a drbd in XEN, and run OpenSSI
 from there, can I use OCFS2 or something or do I have to or better use
CFS?

And last a repeat of the first question, is lenny's openssi in its
current version a good solution for high availablity?




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