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Re: [Xen-users] lustre clustre file system and xen 3


Christopher G. Stach II wrote:
Karsten Nielsen wrote:
The reason fore having a file backend is that I will be able to live
imigrate domU's from one server to the next in case of hardware failor
or extremly high load on one of the physical servers.

That's not a valid reason. :)  There's no requirement to use files for
that.  Use NBD and GFS or DRBD.

Sorry my bad. I ment shared storage for live imigration. Not a file backend. I see the mix up. And my bad english.... :(

My picture should have look like this. Sorry!

---------  ---------
| app 1 |  | app 2 |
---------  ---------
    \        /
     \      /
      \    /
  ----------------
 | shared storage |
  ----------------

I would like to have a very flexible setup. Where I can add application servers as well as more shared storage ( my storage i a server with sata raid 5 up to 4TB)

should I share my storage DRBD and that way be able to add an other shared storage device at later point for HA and on my application servers use GFS or OCFS2 ?

I am testing with Lustre on my shared storage at the moment.


If I understand you correct you suggest that I make a lot of storage
avaliable on both application servers and syncronize data with DRBD ?

But if I add a 3. application server that setup does not work unless i
add storage space on all three application servers and implement that in
the DRBD ?

DRBD is better for HA.  Do you want to load balance or just failover?


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