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| -rw-r--r-- | doc/source/devref/filter_scheduler.rst | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/doc/source/devref/filter_scheduler.rst b/doc/source/devref/filter_scheduler.rst index 1a7be47cb..285374b70 100644 --- a/doc/source/devref/filter_scheduler.rst +++ b/doc/source/devref/filter_scheduler.rst @@ -225,11 +225,16 @@ The line with this description looks the following way: **function_name_weight**. As for default cost function, it would be: `compute_fill_first_cost_fn_weight`, -and by default it is 1.0. +and by default it is -1.0. :: - --compute_fill_first_cost_fn_weight=1.0 + --compute_fill_first_cost_fn_weight=-1.0 + +Negative function's weight means that the more free RAM Compute Node has, the +better it is. Nova tries to spread instances as much as possible over the +Compute Nodes. Positive weight here would mean that Nova would fill up a single +Compute Node first. Filter Scheduler finds local list of acceptable hosts by repeated filtering and weighing. Each time it chooses a host, it virtually consumes resources on it, |