Resolving a problem

Described here are some procedures to help resolve fault conditions that might exist on your system.

Resolving a problem with accessing the management GUI
If you are unable to connect to the management GUI from your web browser and received a Page not found or similar error, this information might help you resolve the issue.
Resolving a problem with SSL certificates
If you are unable to connect to the management GUI from your web browser and received a Certificate expired or similar error, this information might help you resolve the issue.
Resolving a problem with SSL/TLS clients
Changing the security level of the system might cause the web interface, CIM clients, and other SSL/TLS clients to stop working. If any clients stop working, complete the following procedure.
Resolving a problem with offloaded data transfer
When Microsoft offloaded data transfer (ODX) is enabled on a system, it is possible to encounter problems. These procedures help you address some common issues that might arise.
Resolving a problem with Microsoft Windows disk manager
Microsoft Windows disk manager might hang if the host attempts to write to a LUN that is a remote copy secondary volume on a system. This procedure addresses this issue.
Procedure: Shutting down a HyperSwap site
You can shut down one site in a HyperSwap® topology system without it causing hosts to lose access to the HyperSwap volumes, if there is an up-to-date copy of each HyperSwap volume on the site that remains online.
Determining the failing disk controller by using the CLI
You can use the command-line interface (CLI) to determine the failing disk controller.
Diagnosing and resolving problems with fix procedures
You can use fix procedures to diagnose and resolve problems with the system.
Understanding the medium errors and bad blocks
A storage system returns a medium error response to a host when it is unable to successfully read a block. The system response to a host read follows this behavior.
iSCSI performance analysis and tuning
This procedure provides a solution for Internet Small Computer Systems Interface (iSCSI) host performance problems while connected to a system and its connectivity to the network switch.
Debugging iSCSI backend sessions
Complete the steps in the following procedures to debug iSCSI backend sessions.
Ethernet iSCSI host-link problems
If you are having problems attaching to the Ethernet hosts, your problem might be related to the network, the system, or the host.
Procedure: SAN problem determination
You can solve problems on the system and its connection to the storage area network (SAN).
Fibre Channel and 10G Ethernet link failures
You might need to replace the small form-factor pluggable (SFP) transceiver when a failure occurs on a single Fibre Channel or 10G Ethernet link.
Disaster recovery
Use these disaster recovery solutions for HyperSwap, Metro Mirror, Global Mirror, and Stretched System, where access to storage is still possible after the failure of a site.

Parent topic: Troubleshooting