XtreemOS 2.0 has been released. One of its main components is the distributed filesystem XtreemFS.
«XtreemOS brings new opportunities to distributed computing, such as simple management of processes and their monitoring»
As they point out at http://lwn.net/Articles/362285/, it would be interesting to compare XtreemOS and XtreemFS with other solutions, such as
for example Xcpu, which, based on the 9p protocol of Plan9, has a similar purpose.
XCPU: a new, 9p-based, process management system for clusters and grids
Other links of interest: