I usually only lurk on the DF lists, but I just have to jump in and say how cool I think this is. I'll definitely have to try out the next release now..
On Wed, 3 Feb 2010, Matthew Dillon wrote:
:Would such a SSD cache also improve write performance of a HAMMER file :system? :To improve write performance we'd probably need to put the UNDO/REDO log :on a SSD...
No, the first iteration is strictly a clean slaved throw-away copy.
...but you are leaving some room for also using it as a write cache later, right? Whether it's some special hook for HAMMER's un/redo log, or something completely filesystem agnostic, it seems it could be a huge benefit to some applications. (like databases?)
Just thinking out loud: if you have some resident-like way of "locking" data on the SSD, that might be an interesting way to get something similar to ReadyBoost. (That would perhaps make for a neat GSoC project?)
MAgnus
