[ovirt-users] VDSM multipath.conf - prevent automatic management of local devices

[Ben Bradley]

On 23/11/17 06:46, Maton, Brett wrote:
> Might not be quite what you're after but adding
> 
> # RHEV PRIVATE
> 
> To /etc/multipath.conf will stop vdsm from changing the file.
> |||

Hi there. Thanks for the reply.
Yes I am aware of that and it seems that's what I will have to do.
I have no problem with VDSM managing the file, I just wish it didn't 
automatically load local storage devices into multipathd.

I'm still not clear on the purpose of this automatic management though.
 From what I can tell there is no difference to hosts/clusters made 
through this automatic management - i.e. you still have to add storage 
domains manually in oVirt.

Could anyone give any info on the purpose of this auto-management of 
local storage devices into multipathd in VDSM?
Then I will be able to make an informed decision as to the benefit of 
letting it continue.

Thanks, Ben

> 
> On 22 November 2017 at 22:42, Ben Bradley <listsbb at virtx.net 
> <mailto:listsbb at virtx.net>> wrote:
> 
>     Hi All
> 
>     I have been running ovirt in a lab environment on CentOS 7 for
>     several months but have only just got around to really testing things.
>     I understand that VDSM manages multipath.conf and I understand that
>     I can make changes to that file and set it to private to prevent
>     VDSM making further changes.
> 
>     I don't mind VDSM managing the file but is it possible to set to
>     prevent local devices being automatically added to multipathd?
> 
>     Many times I have had to flush local devices from multipath when
>     they are added/removed or re-partitioned or the system is rebooted.
>     It doesn't even look like oVirt does anything with these devices
>     once they are setup in multipathd.
> 
>     I'm assuming it's the VDSM additions to multipath that are causing
>     this. Can anyone else confirm this?
> 
>     Is there a way to prevent new or local devices being added
>     automatically?
> 
>     Regards
>     Ben
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