Owners Manual

a vertical orientation within the disk drawer. Two vertically-stacked drawers each hold 42 disks. If used, 2.5" disks require
3.5" adapters.
These same chassis form factors are used for the supported expansion enclosures; but with I/O modules instead of controller
modules.
The 2U12 and 2U24 enclosures support single or dual-controller module configurations, but the 5U84 enclosure only supports
a dual-controller module configuration. If a partner controller module fails, the storage system will fail over and run on a single
controller module until the redundancy is restored. For 2U enclosures, an controller module must be installed in slot A, and
a controller module or a module blank must be installed in slot B to ensure sufficient airflow through the enclosure during
operation. For 5U84 enclosures, an controller module must be installed in both slot A and slot B.
Upgrading to dual-controller configuration
You can upgrade a 2U single-controller module configuration by adding a second controller module in slot B.
Controller module B can be added while controller module A continues to process host I/O requirements. However, we
recommend scheduling configuration changes during a maintenance window with low or no I/O activity.
Data is not impacted when a controller module B is inserted into the enclosure, but we recommended doing a complete data
backup before proceeding.
NOTE:
● When a controller module B is inserted, the redundancy setting is automatically changed from Single Controller to
Active-Active ULP (Unified LUN Presentation). No manual changes are necessary.
● If PFU (partner firmware upgrade) is enabled, when you add controller module B, the system automatically updates the
firmware on second controller module to match the firmware version on the first controller module.
1. Type the following CLI command to confirm that redundancy is configured as Single Controller Mode:
show advanced-settings
This step confirms that controller module A does not report controller module B as missing.
2. Remove the controller blank from slot B.
3. Grasp the controller module with both hands, and with the latch in the open position, orient the module and align it for
insertion into slot B.
4. Ensuring that the controller module is level, slide it into the enclosure as far as it will go.
A controller module that is only partially seated will prevent optimal performance of the controller enclosure. Verify that the
controller module is fully seated before continuing.
5. Set the module in position by manually closing the latch.
You should hear a click as the latch handle engages and secures the controller module to its connector on the back of the
midplane.
6. Connect the cables.
7. Map the host ports on controller module B.
Removing the second controller
To remove controller module B and revert back to a single-controller configuration:
1. Shut down controller module B.
2. Remove the controller module from the enclosure.
3. Type the following CLI command to change the redundancy settings to Single Controller Mode:
#set advanced-settings single-controller
4. Install a controller blank in slot B.
6
Storage system hardware