[ovirt-users] Faulty multipath only cleared with VDSM restart

[Fred Rolland]

The multipath report does not have any effects on stability/performance.
It is used for creating events to the user in the engine, in order to
detect earlier issues in their storage. [1]

In your case, you would have an wrong alarm in the Engine that would not be
cleared until next Vdsm restart.


[1]
https://ovirt.org/develop/release-management/features/storage/multipath-events/#event-reporting

On Sun, Mar 11, 2018 at 2:23 PM, Bruckner, Simone <
simone.bruckner at fabasoft.com> wrote:

> Hi Fred,
>
>
>
>   thank you for the explanation. I restarted VDSM and will monitor the
> behaviour.
>
>
>
> Does that faulty multipath report have any side effects on stability and
> performance?
>
>
>
> All the best,
>
> Oliver
>
>
>
> *Von:* Fred Rolland [mailto:frolland at redhat.com]
> *Gesendet:* Sonntag, 11. März 2018 11:23
> *An:* Bruckner, Simone <simone.bruckner at fabasoft.com>
> *Cc:* users at ovirt.org
> *Betreff:* Re: [ovirt-users] Faulty multipath only cleared with VDSM
> restart
>
>
>
> Hi Simone,
>
> The multipath health is built on VDSM start from the current multipath
> state, and after that it is maintained based on events sent by udev.
>
> You can read about the implementation details in [1].
>
> It seems that in your scenario, either udev did not sent the needed
> clearing events or that Vdsm mishandled them.
>
> Therefore only restart of the Vdsm will clear the report.
>
> In order to be able to debug the issue, we will need Vdsm logs with debug
> level (on storage log) when the issue is happening.
>
>
>
> Thanks,
>
> Fred
>
>
> [1] https://ovirt.org/develop/release-management/features/
> storage/multipath-events/
>
>
>
> On Fri, Mar 9, 2018 at 1:07 PM, Bruckner, Simone <
> simone.bruckner at fabasoft.com> wrote:
>
> Hi,
>
>
>
>   after rebooting SAN switches we see faulty multipath entries in VDSM.
>
>
>
> Running vdsm-client Host getStats shows multipathHealth entries
>
>
>
> "multipathHealth": {
>
>   "3600601603cc04500a2f9cd597080db0e": {
>
>     "valid_paths": 2,
>
>     "failed_paths": [
>
>       "sdcl",
>
>       "sdde"
>
>     ]
>
>   },
>
>   …
>
>
>
> Running multipath –ll does not show any errors.
>
>
>
> After restarting VSDM, the multipathHealth entires from vdsm-client are
> empty again.
>
>
>
> Is the a way to clear those multipathHealth entires without restarting
> VDSM?
>
>
>
> Thank you and all the best,
>
> Simone
>
>
>
>
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>
>
>
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