# MSM-18/4 Modules

Collect the following information about MSM-18/4 modules:

• Determine the total throughput requirement and the required number of MSM-18/4 modules. The throughput requirement can be based on either meeting the backup window or based on achieving the line rate throughput for each drive. Refer to the Cisco Storage Media Encryption Design Guide for details.

• Determine the placement of the MSM-18/4 modules. Consult the design guide for sample topology and recommendations.

• For large SME setups, determine if the line cards used for ISLs can scale for the FC Redirect configuration. Refer to the Cisco Storage Media Enc ryption Design Guide for details.

Note Generation 2 modules are recommended for ISL connectivity.

• Order the appropriate number of SME licenses.