Re: [Xen-users] Searching for a Filesystem / Storage Solution

[Marc Patino Gómez <mpatino@xxxxxxxxxxxx>]

Hi Kyrios,

I have more or less the same problem than you. I don't want to buy an 
expensive SAN or NAS comercial solution. The solution to our problem 
will be the google filesystem but it is not opensource. I found some 
items to at to your list:
- Lustre filesystem (CFS)
- CLVM
- Distributed RAID over iscsi ( I found some papers about it, in some 
days I will test it)
I know that find a solution to it is dificult, it's not trivial to build 
a system with the the following properties:
- scalable
- reliable
- easy to manage
- low cost
....


Marc


Kyrios wrote:
> Hi list :)
>
> I'm currently planning to setup the following environment:
>
> 4 - 16 physical nodes (starting with 4)
> Each Node is a x86 Machine with 160GB Diskspace.
> Each Node should run about 10 Virtual Machines.
> Each Virtual Machine needs about 2GB Filesystem.
> Live Migration should be used for maintenance times and to 
> redistribute the VMs depending on the load they generate.
> Live Migration needs SAN Storage. Since SAN Storage is expensive I'd 
> like to avoid buying a dedicated solution.
> This is why I'm searching for a fault tolerant solution using the 
> hardware already available.
> I already read articles about:
> * LVS
> * GFS
> * DRBD
> * GlusterFS
> * GNBD
>
> But now I'm totally confused.
>
> Has anyone any good article or Howto on this issue?
>
> What I'm looking for is a virtual Filesystem over all the nodes which 
> can handle if one node goes down.
> Current ideas are something like: Create Block Devices with DRBD using 
> 2 nodes each. Create a stripe over all available DRBDs using LVM and 
> export the Logical Volumes to the DomUs. The problem with that is that 
> I'm "losing" half of the storage (mirroring) - which would be okay - 
> and worse that I would have a single point of failure (The server 
> which is exporting the Logical Volumes).
> Would Xen work with some kind of cluster Filesystem?
>
> I'm really totaly confused.
>
> Best Regards
> Thorsten
>
> --
> ... black holes are where god divided by zero.
> ------------------------------------------------------------------------
>
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