On Dec 17, 2009, at 5:31 PM, Steven Langdale wrote:

In that case you must be using collocation (albeit  by accident).

Not really...  Remember that, within Migpr, migration operates
serially by node, and thus you get a certain amount of same-node data
clumped together on sequential media.  It's not collocation, but
affords some temporal node data co-residency which incidentally helps
restoral times in the short term.  Of course, one should architect
storage utilization, and not depend upon happenstance.

   Richard Sims