DragonFly users List (threaded) for 2009-12
Re: LEAF maintainance - Sat 5-Dec-2009
:If someone has a version 2 HAMMER filesystem, can they go directly to 4?
:I'm assuming this will happen if someone goes from 2.4 to 2.5, or some
:months from now when we release 2.6, assuming no newer versions of HAMMER
Yes, that will work. All intermediate versions will also be
Version 3 is the new snapshot management functions (hammer snapls,
hammer viconfig, etc) functions and storage of snapshots and config
in meta-data instead of in <fs>/snapshots). hammer version-upgrade
will ask you to run a hammer cleanup after the upgrade and hammer
cleanup will move the snapshots and remove the <fs>/snapshots directory.
Version 4 implements the new UNDO FIFO mechanics which removes the
need to disk-sync the volume header when appending to the UNDO FIFO,
which in turn improves flush/fsync performance.
The REDO implementation for improving fsync() even more is not in
yet, that will become version 5.