Re: [RFC PATCH-SERIES cluster/ha-manager/manager/proxmox 0/7] clamp load imbalance to unit interval

["Dominik Rusovac" <d.rusovac@proxmox.com>]

Superseded-by: https://lore.proxmox.com/all/20260429122051.179485-1-d.rusovac@proxmox.com/T

On Mon Apr 27, 2026 at 3:20 PM CEST, Dominik Rusovac wrote:
> # TL;DR 
> clamp load imbalance to value between 0 and 1, and display the value as
> percentage in HA Status panel of PVE UI. 
>
> # Details
> The currently used load imbalance value is given as the so-called coefficient of
> variation (CV), a value that may exceed 1. As such, the CV value alone lacks
> meaning. A CV value of 0.0 means no imbalance, but what does a value of, say,
> 1.7 mean?
>
> Relative to the number of nodes in a cluster, it is possible to determine the
> upper bound of the CV value [0][1]. By dividing the CV value by its upper
> bound, the load imbalance can be represented as a value that varies between 0
> and 1. Expressing the CV as a percentage makes the concept of load imbalance
> easier to interpret.
>
> # Summary of Changes
> This series:
> - represents load imbalance as a value between 0 and 1;
> - adds a maximum value of 1.0 for load scheduler options; and
> - integrates the load imbalance value within the HA status endpoint; 
>   this is to provide feedback on the prevailing load imbalance in the PVE UI.
>
> # Refs
> [0] https://repositorio.ipbeja.pt/server/api/core/bitstreams/8ed9a444-dbe0-402f-9d2f-90c5bf6e418c/content
> [1] https://stats.stackexchange.com/questions/18621/maximum-value-of-coefficient-of-variation-for-bounded-data-set
>
>
> proxmox:
>
> Dominik Rusovac (2):
>   resource-scheduling: clamp imbalance value to unit interval
>   resource-scheduling: re-adjust hardcoded imbalance values
>
>  proxmox-resource-scheduling/src/scheduler.rs  | 33 ++++++++++++-------
>  .../tests/scheduler.rs                        |  8 ++---
>  2 files changed, 25 insertions(+), 16 deletions(-)
>
>
> pve-manager:
>
> Dominik Rusovac (1):
>   ui: from/CRSOptions: add maximum for threshold
>
>  www/manager6/form/CRSOptions.js | 1 +
>  1 file changed, 1 insertion(+)
>
>
> pve-ha-manager:
>
> Dominik Rusovac (3):
>   test: re-adjust logged imbalance values
>   manager: add load imbalance to status
>   api: status: add load imbalance to status
>
>  src/PVE/API2/HA/Status.pm                     |  4 +-
>  src/PVE/HA/Manager.pm                         |  1 +
>  .../log.expect                                |  4 +-
>  .../log.expect                                | 38 +++++++++----------
>  .../log.expect                                |  4 +-
>  .../log.expect                                | 29 +++++---------
>  .../log.expect                                |  2 +-
>  .../log.expect                                |  2 +-
>  .../log.expect                                |  4 +-
>  .../log.expect                                |  4 +-
>  .../log.expect                                |  4 +-
>  .../log.expect                                | 22 +----------
>  12 files changed, 47 insertions(+), 71 deletions(-)
>
>
> pve-cluster:
>
> Dominik Rusovac (1):
>   datacenter config: add maxima for load scheduler options
>
>  src/PVE/DataCenterConfig.pm | 2 ++
>  1 file changed, 2 insertions(+)
>
>
> Summary over all repositories:
>   16 files changed, 75 insertions(+), 87 deletions(-)