[linux-lvm] Should I expect snapshot origin LV's to be 10x slower?

Kevin Jamieson 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.


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