DragonFly users List (threaded) for 2011-12
Re: What is the minimal memory requirement for HAMMER?
>I am trying to experiment with HAMMER with a spare PIII/500Mhz old
>machine with 256MB of RAM. I installed the RELEASE-2.10 version of
>DFBSD. But when I try to execute "hammer cleanup", it spits out an
>error that reads:
>"hammer: System has insufficient buffers to rebalance the tree. nbuf < 3969"
hammer: System has insuffient buffers to rebalance the tree. nbuf < %d
Rebalancing a HAMMER PFS uses quite a bit of memory and can't be done on
low memory systems. It has been reported to fail on 512MB systems.
Rebalancing isn't critical for HAMMER file system operation; it is done
by hammer rebalance, often as part of hammer cleanup.
(this man note was added after dfly-2.10, but applies there also)
I did use HAMMER on a 128MB system (w/ CPU like your system) (NFS server etc)
for a long time, which worked fine; this was until dfly-2.8; I am quite sure 256MB
is fine with current dfly (master), but didn't try recently.
See also issue1552 (http://bugs.dragonflybsd.org/issues/1552) (which introduced message)
for comments/pointers on low memory HAMMER use.
Hope this helps; do you experience HAMMER problems apart from this console message?
>Please throw some light! (Very dark here in Scandinavia during winters
>like this) ;-)
Here in southern Scandinavia (Denmark) we do have a bit of light, but I guess you are north :)