Oracle Exadata Storage Server Software
 
Exadata Database Machine V2
 
Oracle Enterprise Manager
 

PLA-Support>Eng Systems>Exadata/ODA/SSC>Oracle Exadata>DB: Exadata_EST
 

You see the following Warning via EM "...Message=Disk Group DBFS_DG has failure groups with disks of different sizes which may lead to suboptimal space usage. Changing the configuration may alleviate this problem..." The warning can be seen during RBAL operations and may be a false alert.

Applies to:

Symptoms

You receive the following Warning via EM using an Engineered System such as Exadata
 
     EM Alert: Warning:+ASM1_abc - Disk Group DBFS_DG has failure groups with disks of different sizes which may lead to suboptimal space usage. Changing the configuration may alleviate this problem.

Changes

 Recent disk replacement
 

Cause

A RBAL after disk replacement and lead to false alerts regarding Disk size: This is a problem  and can be ignored after some queries are issued to confirm if the warning is valid or due to the RBAL operations seen after disk replacement
 

 

Solution

Assess the storage after the RBAL is completed to confirm if the messages continue to occur

Wait until all RBAL operations have completed and confirm if the messages seen continue to occur based on post RBAL timestamps or not
- If the errors continue, then check the outputs of

• SQL> select * from gv$asm_operation                       --- this should not return any row once re balance is completed.
  
  If the above is completed then issue the following queries
  
  
• SQL> select name, total_mb, os_mb from V$ASM_DISK order by 1;
  
  and queries from  Resizing Grid Disks in Exadata: Example of Recreating RECO Grid Disks in a Rolling Manner (Doc ID 1465230.1)
  - including:
  
  
• $  dcli –g cell_group -l celladmin "cellcli -e list griddisk attributes name,size"
•     dcli –g cell_group -l celladmin "cellcli -e list celldisk attributes name,freespace”
  
•     dcli -g cell_group -l celladmin "cellcli -e list griddisk attributes name,offset | grep -i dbfs_dg"

Ignore the warnings if associated with Disk replacement and RBAL

If the warnings continue however, please contact Oracle support for a review
 

References

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