v
The drive paths from controller A to the storage expansion enclosures are not
optimal.
v
The right power supply and fan unit 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 storage subsystem. Use the
DS Storage Manager client Subsystem Management window and the appropriate
SAN monitoring tools to ensure that there are no problems 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 storage subsystem. It is best practice to perform the
interconnect-battery unit replacement procedure during off-peak I/O traffic hours.
Before removing the interconnect-battery unit, you
must
use the DS 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 without using a proper ground might damage the
equipment. To avoid damage, use proper antistatic protection while handling any
components.
1. Locate the failed interconnect-battery unit by checking the Overall
Configuration Needs Attention LED on the front bezel of the storage
subsystem. (Figure 118 shows the location of the Overall Configuration Needs
Attention LED on the front bezel.)
2. Use the DS Storage Manager client to place controller B offline.
Attention:
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.
3. Remove the front bezel by grasping the sides and pulling the cover toward
you.
Power LED
Overall DS5000 Configuration
Needs Attention LED
Locate/Identify LED
ds50005
Figure 118. Overall Configuration Needs Attention LED on the DS5100 and DS5300 front
bezel
188
IBM System Storage DS5100 and DS5300 Storage Subsystem: Installation, User’s, and Maintenance Guide