2x Xraid + 2 XServe how to use XSAN?

Hello List Users!
I have 2 XRaids and 2 XServes Systems. Each XRaid have 2 Arrays 7x500GB Raid5 and 7x 750GB Raid5.
The 2 Systems backup each other. I would like to publish all Diskspace on each XRAID as one big Networkvolume (2,5 + 4,0 TB) to the public (Just to make it clear for each Xserve/XRaid combination one Volume)
Is this possible to be done with XSAN?
Is it worth doing it with XSAN?
Can I use the 2 XServes as Metadata Controller: One as main controller and one as Backup controller?
Is it still possible to install other software on this XServes. I mean
Here you find a PDF and Omnigraffle file for illustration: http://www.ademmler.de/files/ademmler-xsan.zip
Any hints are more than welcome.
Regards Alex

Dear Donald!
Here is what I wanna do: http://www.ademmler.de/files/xraid-B.pdf
I also want to swap all HD Drives and put all 500GB drives into the main System and all 750 GB drives into the Backup System. The BackupSystem then will have some more space, wich is good for "keeping older data" in the backup (overhead). On the Backup System I will have 1 SpareDrive in each Array. On the main System I wont - I will need all space.
What do you think? Is it possible to switch down XRAID and move all HDs from XRAID2 into XRAID1 and get the same Array/Data working . . .? If yes I will have my backup running while I format XRAID2 with all the new 750GB HDs.
Thank you for your advice
Alex

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Hi,
sorry for my perhaps dumb question but I am new to XServe RAID and did not find an answer to my problem by searching the forum.
In my (university) department we will change our complete server infrastructure this year and I could persuade my colleagues to consider to switch to apple hardware.
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Then I read about XSan but noticed that you need one (or better two!) additional servers for metadata. As the solution must not cost too much and there is no real need to access data from more than one server at the same time the XSan solution would be real overkill.
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The first tip is interesting (and somewhat pricely more affordable). Unfortunately in a failure case by using the synced RAID there would be some data inconsistencies as the sync process would be made only in certain time intervals, e.g. every hour. When the primary server and its copy of the RAID comes back online there would be the problem to determine which copy of a file is to be kept.
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