[linux-lvm] faster snapshot creation?
ewtoombs at uwaterloo.ca
Sat Feb 22 11:58:53 UTC 2020
Snapshot creation is already pretty fast:
> $ time sudo lvcreate --size 512M --snapshot --name snap /dev/testdbs/template
> Logical volume "snap" created.
> 0.03user 0.05system 0:00.46elapsed 18%CPU (0avgtext+0avgdata 28916maxresident)k
> 768inputs+9828outputs (0major+6315minor)pagefaults 0swaps
That's about half a second in real time. But I have a scenario that
would benefit from it being even faster. I'm doing many small unit tests
starting from a template filesystem. I do the snapshot, run the unit
test on the snapshot, then delete the snapshot afterwards using
lvremove. Each unit test, though, takes much less than a second to run
(often on the order of 10ms), so most of the time is being spent making
So, is there a sort of "dumber" way of making these snapshots, maybe by
changing the allocation algorithm or something?
More information about the linux-lvm