| Hot-adding disk shelves with IOM12 modules |
Disk shelves with IOM12 modules must be in their own unique stack.
• A system can have multipathed and quad-pathed stacks of disk shelves with IOM12 modules.
If you have an HA pair, ETERNUS AX/HX Series shows the system configuration as “multipath HA”. If
you have a single-controller configuration, ETERNUS AX/HX Series shows the system configuration as
“multipath”.
• This procedure assumes your configuration is using in-band ACP.
For configurations that have in-band ACP enabled, in-band ACP is automatically enabled on hot-added
disk shelves. For configurations in which in-band ACP is not enabled, hot-added disk shelves operate
without any ACP functionality.
• Nondisruptive stack consolidation is not supported.
You cannot use this procedure to hot-add disk shelves that were hot-removed from another stack in the
same system when the system is powered on and serving data (I/O is in progress).
Best practice considerations
• The best practice is to have the current version of the Disk Qualification Package (DQP) installed before
hot-adding a disk shelf.
Having the current version of the DQP installed allows your system to recognize and utilize newly qualified
disk drives; therefore, avoiding system event messages about having non-current disk drive information.
You also avoid the possible prevention of disk partitioning because disk drives are not recognized. The DQP
also notifies you of non-current disk drive firmware.
Fujitsu Downloads: Disk Qualification Package
• The best practice is to run Config Advisor before and after hot-adding a disk shelf.
Running Config Advisor before hot-adding a disk shelf provides a snap shot of the SAS connectivity, verifies
disk shelf (IOM) firmware versions, and allows you to verify shelf IDs already in use on your system.
Running Config Advisor after hot-adding a disk shelf allows you to verify SAS connections are cabled
correctly and that shelf IDs are unique within the HA pair or single-controller configuration.
If any SAS cabling or duplicate shelf ID errors are generated, follow the corrective actions provided.
You need network access to download Config Advisor.
Fujitsu Downloads: Config Advisor
• The best practice is to have the current versions of disk shelf (IOM) firmware and disk drive firmware on
your system before adding new disk shelves, shelf FRU components, or SAS cables.
Current versions of firmware can be found on the Fujitsu Support Site.
Fujitsu Downloads: Disk Shelf Firmware
Fujitsu Downloads: Disk Drive and Firmware
SAS cable handling considerations
• Visually inspect the SAS port to verify the proper orientation of the connector before plugging it in.
The SAS cable connectors are keyed. When oriented correctly into a SAS port, the connector clicks into
place and if the disk shelf power is on at the time, the disk shelf SAS port LNK LED illuminates green. For
disk shelves, you insert a SAS cable connector with the pull tab oriented down (on the underside of the
connector).
For controllers, the orientation of SAS ports can vary depending on the platform model; therefore, the
correct orientation of the SAS cable connector varies.
• To prevent degraded performance, do not twist, fold, pinch, or step on the cables.
Cables have a minimum bend radius. Cable manufacturer specifications define the minimum bend radius;
however, a general guideline for minimum bend radius is 10 times the cable diameter.
• Using Velcro wraps instead of tie-wraps to bundle and secure system cables allows for easier cable
adjustments.
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