Dot Hill Systems II 200 FC service manual Adding an Expansion Unit to an Existing RAID Array

Carefully consider the following limitations of special high-capacity configurations. Using multiple SANnet II 200 FC arrays connected to the same SAN normally provides significantly better performance than one high-capacity configuration.

■Maximize the size of each logical drive (up to 1908 Gbyte) before creating another logical drive in order to allow for maximum storage capacity.

■SANnet II 200 FC arrays can be connected to SANnet II 200 FC expansion units. They can also be connected to a maximum of five SANnet II 200 SATA expansion units and SANnet II 200 FC expansion units, in any combination.

■SANnet II 200 SATA arrays can only be connected with SANnet II 200 SATA expansion units.

Refer to the SANnet II 200 FC and SATA Array Best Practices Manual for more information and sample cabling diagrams.

Note – Large configurations might require the use of one or more optional extended- length cables, part number X9732A. Other items might also be required. Refer to the SANnet II Family FRU Installation Guide for information about supported cables, SFPs, and other user-replaceable items.

4.14Adding an Expansion Unit to an Existing RAID Array

To install an expansion unit to an existing, configured RAID array, perform the following steps.

1.Stop I/O and shut down the controller to ensure that all data in the cache is written to disk.

For details on shutting down the controller, see “Powering Off the Array” on page 4-33.

2.Verify that the loop ID of the expansion unit is set to a different ID than the RAID unit and any expansion units already attached.

For details on loop IDs, see “Setting Loop IDs on Expansion Units” on page 4-13.

3.Physically cable the new expansion unit to the array using a valid cabling configuration.

Refer to the SANnet II 200 FC and SATA Array Best Practices Manual for more information on expansion unit cabling configurations.

4.Power on the expansion units.

For details on the power-on sequence, see “Power-On Sequence” on page 4-32.

5.Power on the RAID array.

4-30SANnet II 200 FC, SATA, and SATA SE Array Installation, Operation, and Service Manual • March 2005