[DRBD-user] Slow linstor queries after recent upgrade

[Roland Kammerer]

On Wed, May 10, 2023 at 04:49:56PM +0200, Łukasz Wąsikowski wrote:
> W dniu 08.05.2023 o 09:46, Roland Kammerer pisze:
> > On Sun, May 07, 2023 at 02:45:53PM +0200, Łukasz Wąsikowski wrote:
> > > Hi,
> > > 
> > > I'm using Linstor on 5 node Proxmox 7.x cluster. After recent upgrade I've
> > > got some performance issues with some linstor queries.
> > > 
> > > Upgrade: linstor-common:amd64 (1.20.2-1, 1.22.1-1), python-linstor:amd64
> > > (1.16.0-1, 1.18.0-1), linstor-client:amd64 (1.16.0-1, 1.18.0-1),
> > > linstor-controller:amd64 (1.20.2-1, 1.22.1-1), linstor-satellite:amd64
> > > (1.20.2-1, 1.22.1-1), linstor-proxmox:amd64 (6.1.0-1, 7.0.0-1)
> > I'm pretty sure this isn't a LINSTOR issue but more a linstor-proxmox
> > issue: Proxmox calls the plugins status API *a* *lot*. And in case of
> > LINSTOR it isn't only that 1 nodes calls the controller a lot, but all
> > the nodes query it separately. There is a "cache" in the Proxmox API and
> > we even rolled our own that is stored persistently in the file system.
> > With 7.0.0 we are in a situation where we can not use the cache as
> > efficient as before, and I guess that shows. You can a) increase
> > "statuscache", or you can downgrade to 6.1.0. 6.1.0 should be fine, the
> > only thing that changed was improved storage information, but if you
> > have been happy so far, please downgrade. I have an idea how we can keep
> > the information in the cache more efficiently, but that will also
> > require some development effort in LINSTOR itself.
> 
> That helped, thank you!

Too much technical details, but we we did the necessary development, a
new LINSTOR RC1 should follow early next week and I will adapt the
plugin during the RC period. So next LINSTOR + linstor-proxmox 7.0.1
should then behave on larger setups again. Sorry for the inconvenience.
Probably also a good call for people to test RCs, I do them for a
reason.

Regards, rck