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There are several storage devices (LUNs) allocated to the instance. However, the I/O activity is not spread evenly across these storage devices. The contention on the heavy storage devices increases the response time for the activities run on them. Such a situation can be caused by imbalanced internal database activity, contention on the storage device by other applications or an inefficient RAID policy.
| Unbalanced Storage Devices Activity |
| Description | |
| What to do next | n Compare the storage devices activity over time. n Examine the storage devices statistics. |
| Advice | n In the activity workspace, check which database files are the most I/O consuming and spread them evenly across the storage devices. n Consult with the storage administrator and check for other applications using the same storage devices or their underlying physical disks. n Consult with the storage administrator about the RAID policy. A different striping may spread the I/O load across the storage devices. |
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