[linux-lvm] heat map

Alasdair G Kergon agk at redhat.com
Mon Jun 24 19:24:33 UTC 2013

On Mon, Jun 24, 2013 at 12:04:00AM -0700, matthew patton wrote:
> If some older man pages are to be believed there once was a capability
> to keep a heat map of busy extents. Is there a way to revive that
> capability? I expect "last I/O within 30 seconds, 5 minute, 15minute" is
> probably sufficient for most uses as well as summary counters along the
> same lines.
Mikulas is developing a replacement here:

Documentation appears at the end of the kernel patch.

If you want to try it out at the moment, you'll need this patch first I think:


More information about the linux-lvm mailing list