D-Link DSN-520 Software User's Guide for DSN-1100-10 - Page 138
Troubleshooting
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Problem Symptom Description and Probable Cause Recommended Corrective Actions Software upgrade appears to complete quickly, but upgrade is not performed; error message on the serial diagnostic console: *** Error reading from socket. If you have a firewall enabled, port 21 that is used by the software upgrade process may be blocked. Temporarily disable your Windows Firewall on your host system so you can perform the software upgrade, then re-enable the firewall after the software upgrade has completed successfully. For more information, see section 9.3. Battery Failure message in the Event History Log The battery backup module failed or fell below the allowable minimum charge level. For DSN-1100/2100/3200/3400 systems, verify that the battery is properly connected to the controller. For DSN-5000 series systems, replace the controller module. Power Supply Failure message in the Event History Log A power cable could have been disconnected from the power supply unit or the AC power receptacle, or the power supply unit may have failed. Check all power cable connections. Contact D-Link Technical Support to request an RMA for a replacement power supply. Slower data transfer performance than expected Mismatch of network configuration among your host servers, network switches and the xStack Storage system. Other background tasks (such as Parity volume initialization or a volume scan) may be running. Incorrect battery policy setting or a failed battery. Verify that all network connections are configured to run at 1 Gbps, and that the MTU sizes are consistent between the storage array and your network infrastructure. If the Volume type is Parity, wait until the initialization process and other background tasks have completed. Verify that the System Battery Policy is set to Write-Back mode. Check if either Battery has failed, as the default Battery Policy will switch from Write-Back to Write-Through. When using redundant controllers, if the Battery in Controller-1 is "charging", this will force Controller-0 into Write-Through mode even though its Battery is fully charged. Verify that a battery failure has not occurred, or replace the battery or controller module if it has failed. 128 Chapter 10 Troubleshooting