HDFS is not a normal file system.  Instead highly optimized for running map-reduce.  As such, it uses replicated storage but imposes a write-once model on files.

This probably makes it unsuitable as a primary storage for VM's.

What you need is either a conventional networked storage device or if Hadoop-like capabilities are important then something like MapR which allows complete NFS access to the file system while still being compatible with Hadoop for running map-reduce programs.

On Tue, Jul 12, 2011 at 4:44 AM, shanice msuya <shanicemsuya@gmail.com> wrote:
I mean I want to place some virtual machines inside Xen server, but I want Xen to run ontop of HDFS not a normal linux file system. But I don't know how to run Xen server in HDFS

On Mon, Jul 11, 2011 at 11:47 PM, Robert Evans <evans@yahoo-inc.com> wrote:
What do you mean by run Xen server in HDFS? Do you mean you want to use Xen to allocate data nodes?


On 7/11/11 8:37 AM, "shanice msuya" <shanicemsuya@gmail.com> wrote:

Hi all.
I am trying to run xen server in hdfs but I am not sure how to do it? any ideas/help