Hot-Adding Disk Shelves With Iom12 Modules; Requirements For Hot-Adding Disk Shelves With Iom12 Modules; Considerations For Hot-Adding Disk Shelves With Iom12 Modules - Fujitsu ETERNUS AX Series Installation And Cabling Manual

Hot-adding disk shelves with IOM12 modules

You can hot-add one or more disk shelves with IOM12 modules to an existing stack of disk shelves with IOM12
modules or hot-add a stack of one or more disk shelves with IOM12 modules directly to a SAS HBA or an
onboard SAS port on the controller.

Requirements for hot-adding disk shelves with IOM12 modules

Your system must meet certain requirements before hot-adding disk shelves with IOM12 modules.
State of your system
• Your system and version of ETERNUS AX/HX Series must support the disk shelves you are hot-adding,
including the IOMs, disk drives, and SAS cables.
• Your system must have less than the maximum number of disk drives supported, by at least the number of
disk shelves you plan to hot-add.
You cannot have exceeded the maximum number of disk drives supported for your system after hot-adding
disk shelves.
• If you are hot-adding a stack of one or more disk shelves (directly to the platform controllers), your system
must have enough available PCI SAS HBA or onboard SAS ports or a combination of both.
Note: If you need to install an additional PCI SAS HBA, the best practice is to use 12Gb SAS HBAs to keep
controller-to-stack connectivity at 12Gbs for maximum performance. Using 6Gb SAS HBAs or a combination
of 6Gb SAS HBAs and 12Gb SAS HBAs is supported; however, IOM12 module connections to 6Gb SAS HBAs
are negotiated down to 6Gbs, resulting in lower performance.
• Your system cannot have any SAS cabling error messages.
You must correct any cabling errors using the corrective actions provided by the error messages.
Using mini-SAS HD SAS optical cables
• If you are using mini-SAS HD SAS optical cables or a mix of mini-SAS HD SAS optical cables and SAS copper
cables in the stack of disk shelves, you must have met the rules in the "Mini-SAS HD SAS optical cable
rules" section.
• If you are hot-adding a disk shelf with mini-SAS HD SAS optical cables to a stack of disk shelves that is
connected with SAS copper cables, you can temporarily have both cable types in the stack.
After hot-adding the disk shelf, you must replace the SAS copper cables for the rest of the shelf-to-shelf
connections in the stack and the controller-to-stack connections so that the stack meets the rules in the
"Mini-SAS HD SAS optical cable rules" section. This means that you must have ordered the appropriate
number of mini-SAS HD SAS optical cables.

Considerations for hot-adding disk shelves with IOM12 modules

You should familiarize yourself with aspects and best practices about this procedure before hot-adding disk
shelves.
General considerations
• If you are hot-adding a disk shelf with IOM12 modules to an existing stack (of disk shelves with IOM12
modules), you can hot-add the disk shelf to either end—the logical first or last disk shelf—of the stack.
For HX2000 systems single-path HA and single-path configurations, you hot-add disk shelves to the end of
the stack that does not have controller connections.
• You can hot-add a stack of disk shelves with IOM12 modules to a system that has existing stacks of disk
shelves with IOM6 and IOM3 modules.
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