The Cell Balance alarm is raised when there is an unequal distribution of work-load between the Exadata Storage Servers (Cells).
The source of this alarm could be:
Actions to take:
The balance metric is based on total reads and writes for each cell. To determine whether there is an unequal distribution of work-load the Kruskal-Wallis Non Parametric test (to a 95% probability) is applied to the 30 most recent historical values. For installations where there are two Exadata Storage Servers the Mann-Whitney U test is used.