ATTO Technology VT-Class If a power supply fails, If you cannot read or write to the Diamond-VT

•Follow the instructions in the appropriate chapters of this manual to remove, replace and reconfigure the drive such as Hot Swap Operating Instructions on page 69.

•You may copy drives by using Command Line interface commands. Refer to Drive Management Commands on page 41.

If a power supply fails

•Verify the power cord is correctly plugged and there is power at the power receptacle.

•If there is power, the cord is secure and the blower and power supply LEDs are off, replace the blower unit. Refer to Hot Swap Operating Instructions on page 69.

•If there is power, the cord is secure and the power supply LED is off, but the blower LED is on, replace the power supply Refer to Hot Swap Operating Instructions on page 69.

•Command Overlap: The Diamond-VT contains special software to take advantage of the Command Overlap feature offered in some high performance disk drives. Because all 24 disk drives in a Diamond Array may be seeking at the same time under Command Overlap, only Diamond-VTs with two operational power supplies and blower assemblies will support Command Overlap: the Diamond-VT will automatically disable the Command Overlap feature if a power supply fails and notify the system administrator through the audible alarm and CLI.

If you cannot read or write to the Diamond-VT

You may have lost connection to the host via the Host Interface Card. The HIC LED on the back of the Diamond-VT should be lit green. The amber LED should go out and the green LED should light when the connection is complete.

Also check the host bus adapter (HBA) in the host machine for proper functioning and drivers.

•Verify that the connector and both ends of the cable are completely seated.

•Try connecting directly to the host, bypassing any hubs or switches.

To determine if the problem exists with the Host Interface Card or the connection

• Swap the cable from one HIC to the other HIC.

•If the LED is now green, swap the GBIC and cable back to the original HIC. If the LED is green, then the GBIC is defective; if it is amber, the HIC is defective.

•Swap the defective HIC or GBIC (see Hot Swap Operating Instructions on page 69)

If you can’t access the Diamond-VT CLI via Ethernet

•Verify there are three or fewer concurrent sessions using Telnet or FTP. You may be the fourth session or someone in another session has entered a command which requires a Save Configuration command.

•Verify you are using a crossover cable for direct connection, or a network cable for a network connection.

•Verify the Diamond-VT is set to IPDHCP enabled if you expect an IP address will be assigned by the network and DHCP is an option available on the network.

•Verify the IP address is compatible with the host.

•Verify the system is functioning and accessible via in-band inquires such as Disk Management.

•Try setting your terminal emulator with a different baud rate, starting at 2400, then 9600, 19200, 38400, 57600, and 115200.

•If you perform a hardware restart, the Ethernet connection is dropped. You must re-establish the Ethernet connection.

•If you enter a command that requires a Save Configuration or RestoreConfiguration command in either the serial interface window or the Ethernet connection window, you will not be able to access the inactive window until the command is complete in the active window.

•If you still fail to communicate with the Diamond- VT, swap out the management card and try to connect using default settings.

If you do not see the appropriate number of LUNs on the host machine

•Ensure any configuration changes are appropriate

•Type FirmwareRestart in CLI

•Re-start the host computer

•Verify all drives associated with the missing LUN(s) are inserted properly and powered up.

62 Troubleshooting