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

[Marc Patino Gómez <mpatino@xxxxxxxxxxxx>]

Hi Kyrios,

sorry because my english, I don't want to say that google fs can be 
purcharsed. I read some papers about Google fs, it looks great. The most 
similar fs that I found is Lustre fs, but until 2008 it will not have 
"Multi-server file RAID-1 (mirroring)" (acording to the clusterfs 
roadmap), so noadays clusterfs is not fault tolerant without shared 
storage. Some of the bigest cluster in the world use clusterfs. I found 
a blueprint from Sun Microsystems quite interesting, using clusterfs:
http://www.sun.com/blueprints/0507/820-2187.html

Marc

Kyrios wrote:
> Hi Marc,
>
> much thanks for your input!
>
> I didn't know that GooFS can be purchased. I already thought that it 
> would be a good solution.
> Also if I find something else I will let you know.
>
> Bye
> Thorsten
>
> On 7/5/07, *Marc Patino Gómez* <mpatino@xxxxxxxxxxxx 
> <mailto:mpatino@xxxxxxxxxxxx>> wrote:
>     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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>
>
>
>
> --
> ... black holes are where god divided by zero. 

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