PowerFlex: STORAGE_POOL_UNBALANCED SIO02.04.0000009

The below alert can be observed in the PowerFlex Manager log events and Dial Home SIO02.04.0000009 will be triggered. 

The Storage Pool relies too heavily (over 50%) on capacity from a single SDS or Fault Set.

Balance capacity over other SDSs or Fault Sets.

This alert can be triggered if you have SDSs or Fault Sets that are not equal in size which may result in one SDSs or Fault Set is handling 50% of the Storage Pool (SP) workload. 

If the SDSs or Fault sets are not symmetrical and equal in size, the recommended fix for this alert is to move some physical disks from the large SDS to the others or add disks to the smaller SDS in order to approximate the capacity of the large SDS as much as possible. 

However, if your SDSs or Fault Sets are equal in size or not big different in size between them, this alert can be cosmetic and will be cleared by itself after few seconds as shown in the screenshot in the Symptoms section. 

1- Go to Block => Storage Pools => Select the SP in Question => Modify => General Settings. 

2- In General Settings for the given Storage Pool ensure that Enable Rebuild/Rebalance is checked.