[linux-lvm] Should I expect snapshot origin LV's to be 10x slower?
kjamieson at bycast.com
Fri Jun 1 19:37:47 UTC 2007
Alex Owen wrote:
> I have been using commands of the form:
> time dd if=/dev/zero of=/dev/volgroup/test bs=1M count=100
> to get speeds for copying to a LVM device both WITH and WITHOUT a
> single snapshot.
> It seems that writes take >=10 times longer the first time a newly
> snapshot origin device is written to.
You may want to try the kernel patch posted here:
That change gave me a significant speedup in similar tests.
More information about the linux-lvm