Attention: Verify that the power supply and fan unit does not snag any other DS4800 cables when you slide it into the bay. d. Press the power supply and fan unit fully into the slot, engaging the pins on the enclosure. e. Hold open both latches and push both left and right levers simultaneously to the closed position. Release the latches. When you release the latches, you should hear both latchessnap over the levers, indicating that the power supply and fan unit is locked in place. 11. Wait up to 5 minutes for the DS4000 Storage Manager client software to recognize the new power supply and fan unit. 12. Complete any remaining Recovery Guru procedures for power supply and fan unit replacement, if needed. 13. Did this correct the problem? v Yes – Go to step 14. v No – Verify the following:– Both power supply and fan unit switches on the back of the DS4800 are turned on. – The circuit breaker for the electrical outlet that DS4800 connects to has not been tripped. – The circuit breaker in the DS4800 RAID controller that the power supply and fan unit is linked to has not been tripped. (The right power supply and fan unit is linked to controller A; the left power supply and fan unitis linked to controller B.) See “Resetting the controller circuit breakers” on page 134. If the problem persists after you have checked the above, contact your IBM service representative. 14. Remove the antistatic protection. 15. Install the front bezel by aligning the pins on the storage subsystem chassis with the spring-steel retainers on the cover, and then press the cover toward the chassisuntil the pins snap into place. 16. Use the DS4000 Storage Manager Subsystem Management window to check the status of components in the storage subsystem. 17. Do any storage subsystems have a fault (Needs Attention) status? v Yes – Select the Recovery Guru toolbar button in the Subsystem Management window, and complete the recovery procedure. If the problem persists, contact your IBM servicerepresentative. v No – Go to step 18. 18. Use the DS4000 Storage Manager client software to print a new storage subsystem profile.
Replacing the interconnect-battery unit
Use the following procedure to replace the interconnect-battery unit. Attention: Never remove the interconnect-battery unit unless directed to do so by an IBM service representative. In addition, do not replace theinterconnect-battery unit in any of the following situations: v The DS4800 controller A is not in optimal state. v The FC paths from the hosts to the host ports in controller A are not optimal.
IBM System Storage DS4800 Storage Subsystem: Installation, User’s, and Maintenance Guide
v The drive paths from controller A to the storage expansion enclosures are not optimal. v The right power supply and fanunit is not powered on or not optimal. The reason not to replace the interconnect-battery unit in any of the above situations is because controller A is the designated controller to receive all I/Os when the interconnect-battery unit is removed from the DS4800. Use the DS4000 Storage Manager client Subsystem Management window and the appropriate SAN monitoring tools to ensure that there are noproblems with controller A or with the connection from the host to controller A. Also note that LUN Failover between controllers is disabled during this procedure because controller B must be placed offline before the interconnect-battery unit is removed from the DS4800. It is recommended to perform the interconnect-battery unit replacement procedure during off-peak I/O traffic hours. Beforeremoving the interconnect-battery unit, you must use the DS4000 Storage Manager client to place controller B offline. Controller A must display Optimal status before removing the interconnect-battery unit. Do not remove the interconnect-battery unit if controller A does not display Optimal status. Electrostatic discharge can damage sensitive components. Touching the storage subsystem or its components...