On Thu, 10 Jun 2010 18:40:11 -0400
Miles Fidelman [off-list ref] wrote:

Yes... went with internal.

I'll keep an eye on write performance.  Do you happen to know, off hand, 
a magic incantation to change the bitmap-chunk size? (Do I need to 
remove the bitmap I just set up and reinstall one with the larger chunk 
size?)

Remove (--bitmap=none) then add again with new --bitmap-chunk.

-- 
With respect,
Roman