JohnS wrote, On 08/05/2010 11:24 AM: > On Thu, 2010-08-05 at 11:04 -0400, Todd Denniston wrote: >> You speak of transactions in a way that makes me think you are dealing with databases. >> If this is the case, then I suggest you take a few searches over to the drbd archives** and look for >> database issues, IIRC ... ... >> Not saying that having the DB on top of gluster or DRBD too would be bad, just suggesting that you >> may want to have the DB backed by something that fully understands the transactions. > --- > Nice analogy have you ever done this? Have you done this with separate > Read Write DBs? How about streaming to a file (constant backup). The > OP is talking about virtual machine images.... > The reason I suggested the googleing (a few searches) in the drbd list, is that I have _read_ the discussions on the list, and Recalled that some found it more appropriate for the DB to do the work. I on the other hand have fortunately only been an observer of the discussions, not a participant, nor a user of the ideas. i.e. I only have the metadata that there have been some good (well reasoned and polite) discussions of database replication on that list, which I believe would apply equally to a DB on DRBD and to a DB on a replicating file system. -- Todd Denniston Crane Division, Naval Surface Warfare Center (NSWC Crane) Harnessing the Power of Technology for the Warfighter