Re: [pve-devel] [RFC PATCH-SERIES ha-manager 0/2] Negative Node Affinity Rules

["Daniel Kral" <d.kral@proxmox.com>]

On Tue Feb 24, 2026 at 1:22 PM CET, Fiona Ebner wrote:
> Am 19.12.25 um 2:36 PM schrieb Daniel Kral:
>> For larger HA clusters, specifying the nodes in simple* node affinity
>> rules as opt-out (negative) instead of opt-in (positive) can make the
>> rule set easier to follow and implement by users.
>> 
>> * simple = without priority groups
>> 
>> 
>> There's no web interface integration yet, because I'm not entirely sure
>> yet how to integrate it with the concept of priority groups for positive
>> node affinity rules, which do not make sense in this context as the
>> specified nodes will be removed from the effective node set.
>
> Wouldn't it be enough to not use/show the priority column when the
> affinity is negative?
>
> If people need both, to exclude certain nodes and to prioritize certain
> others, they can use two rules:
> 1. a negative node affinity rule
> 2. a non-strict positive node affinity rule with priorities

Yes, this would only need some changes in the checks for node affinity
rules to allow both types for a HA resource at once and a check that
they do not contradict one another.

I'm only contemplating about whether this could bite us later on if we
allow those rule sets and should wait for the demand for this.

>> As the conversion is pretty straightforward, we could even allow users
>> to convert between positive and negative node affinity rules (e.g. when
>> switching the affinity type in the web interface?).
>
> Limited to those without priorities I suppose ;)

Right :).

I'll see what makes sense in the web interface then, but it would
probably be the easiest to restrict changing the type of the node
affinity rule after it was created... Other options would be to either
just reset the node selection or drop the node priorities and invert the
selection if users change from 'positive' to 'negative'.