On Thu, 2021-09-30 at 16:07 +0800, heming.zhao@xxxxxxxx wrote: > On 9/30/21 3:51 PM, Martin Wilck wrote: > > > Another performance story: > The legacy lvm2 (2.02.xx) with lvmetad daemon, the event-activation > mode > is very likely timeout on a large scale PVs. > When customer met this issue, we suggested them to disable lvmetad. > Right. IIRC, that used to be a common suggestion to make without having detailed clues about the issue at hand... it would help more often than not. In theory, I believe that a well written daemon maintaining and consistent internal state (and possibly manipulating it) would scale better than thousands of clients trying to access state in some shared fashion (database, filesystem tree, whatever). I have no clue why that didn't work with lvmetad. It had other issues I never clearly understood, either. No need to discuss it further, as it has been abandoned anyway. Martin _______________________________________________ linux-lvm mailing list linux-lvm@xxxxxxxxxx https://listman.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
