It is now possible to mount a Hammer PFS via NFS, though you’ll want to use NFSv3.
Hey, look at what Michael Neumann’s doing: making Hammer expandable! It will be possible to expand your Hammer volumes while online, even.
(note: it’s experimental; don’t be surprised if it destroys data.)
The hammer command now has an ‘info’ option, which gives a great deal of information on your Hammer drives, thanks to Antonio Huete Jimenez. (Committed)
Matthew Dillon has a new version of Hammer, which speeds up listings from programs like ‘ls -la’ and ‘find’. This is only in 2.3.1.x code right now, so don’t force an upgrade via hammer version-upgrade if you’re still on DragonFly 2.2. His post includes some benchmarks.
On a side note: sili(4) tests look good.
As Jim Chapman found out, dump only works for UFS, and not for Hammer. Matthew Dillon outlined the different mirroring and snapshot methods that Hammer makes available.
Siju George described his efforts to set up a continuous, automatic backup system using Hammer, with some interesting results. Matthew Dillon chimed in with some suggestions.
Matthew Dillon’s made some small changes to Hammer; it should result in a small speedup when copying data.
A number of people have noticed that Hammer’s pruning (which by default runs once at midnight) makes systems temporarily unresponsive. Matthew Dillon’s committed a fix for this, with warnings of more improvements to come.
I recently did a bulk build of pkgsrc on two similar machines; the only significant difference being extra CPU work being done on one system, and Hammer snapshots on the other. However, they’re diverging in speed over time, which is interesting but not yet conclusive. Read my post about it for more details.
A good benchmarking project would be testing Hammer with snapshots on and with snapshots off.
Sdävtaker is giving a “Hammer administration” presentation at BSDDay, May 29th and 30th in Argentina. (His presentation is the second day.)
Daniel Lorch, the student working on a port of Hammer to Linux, has a blog, with some notes on progress. I found this April item entertaining.
Pedro F. Giffuni suggested that the SEEK_HOLE and SEEK_DATA lseek extensions would be good additions to Hammer, and linked to a Sun paper that went into more detail.
Daniel Lorch is working on a port of Hammer to Linux’s VFS, though since he’s using FUSE, it will be able to reach other systems, like NetBSD. The code is accessible.
Matthew Dillon is trying to track down a Hammer bug where directory entries (files, usually) are missed, whether it’s with ls or find or similar. Has this happened to you? It’s apparently very hard to duplicate, so please speak up if it has.
Hammer’s ‘undo’ now has the ability to index and automatically diff historical versions of files for you, thanks to a patch from Joel K. Pettersson. (He’s got more ideas, too.
Simon ‘corecode’ Schubert has a student working on a Linux port of Hammer. This will lead to a breakout of Hammer from the DragonFly tree, too.
Matthew Dillon has added a “rebalance” feature to Hammer, which cleans up the underlying B-Tree structures in Hammer that might otherwise slow down searching. It’s considered experimental, so be careful with it for now.
A bunch of links, cause that’s the easiest way to get this all out:
Hammer filesystem, meet Hammer OS. Please don’t take this seriously.