Matthew Dillon (re?)added a sysctl: vfs.hammer2.cluster_write. It defaults to off, since HAMMER2 already writes a large buffer size and this should, in theory, not be needed. It may improve performance in some situations where there’s a lot of file creation and deletion, but that’s my theoretical guess rather than anything I’ve bennchmarked.
2 Replies to “HAMMER2 and clustered writing”
Comments are closed.
When I first read the title, I was hoping for multi-master writing in a cluster of dragonfly machines.
Hmm, this seems to be sort of like ZFS’s write cache. DragonFly has had a read-cache (swapcache) for some time now. This I imagine should also make writes to heavily written to databases go more smoothly.