6 Feb
2012
6 Feb
'12
3:20 a.m.
Toby Corkindale wrote:
I'm giving btrfs another go now; pity about losing the block-based dedup (which is great when you have a lot of virtual machine images)
Um, cp --reflink=yes host0.img host1.img. You don't get *de*dupping (yet), but if you explicitly tell btrfs that the new file should start off with the same blocks as the old file, they'll be non-dupped to begin with. OK, granted, over time they will drift apart and dedupped would have helped if both VMs made the same changes to the same virtual blocks, but AFAICT --reflink solves the first 90% of the problem.