Lustre discuss - May 2006 - Lustre as root

Jaideep Dharap wrote:
> 
>  I have a couple of questions related to mounting lustre as root.
> 
>  1.  I have been unable to unmount the ramdisk once I mount lustre as root.
>  I think this is because of the "acceptor"  daemon that is
started from
>  inside the ramdisk. What exactly is the function of this daemon? Would
>  it be possible to kill the daemon and restart it without crashing the 
> filesystem?
There is no harm in killing and restarting it.
>  2. I am seeing error messages for mmap files? What is the extent of the 
> support for mmap   files currently?
mmap reads and writes will work, but are not guaranteed to be 100% 
consistent, because those regions are not yet always protected by locks.

This is rarely an issue for most users, because the mmap regions are not 
usually being written/read concurrently.  Neverteless, it is something 
which we will of course address in a future release.

-Phil

I have been succesful mounting lustre as root for a 2-node OpenSSI cluster
  <http://www.openssi.org>. The configuration I use is basically a node
   running base linux  + lustre kernel and  serving the "root
partition".
   The 2 cluster nodes are running OpenSSI+lustre kernel and act as lustre
clients.
                                                                               
 
  I have a couple of questions related to mounting lustre as root.

  1.  I have been unable to unmount the ramdisk once I mount lustre as root.
  I think this is because of the "acceptor"  daemon that is started
from
  inside the ramdisk. What exactly is the function of this daemon? Would
  it be possible to kill the daemon and restart it without crashing the 
filesystem?
  2. I am seeing error messages for mmap files? What is the extent of 
the support for mmap   files currently?