Dell DD and PowerProtect Hardware 8.0 Features and Specifications

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Slot addition rules

This system has 12 slots for I/O modules. Slots 0, 2, 3, 6, 9, and 11 are reserved for mandatory I/O modules. Slots 1, 4, 5, 7, 8, and 10 support optional host interface I/O modules. The maximum supported number of any type of host interface (Ethernet or FC) I/O module is four.

NOTE:The maximum number of host interface I/O modules that are listed above does not include the 10 GbE Optical I/O module for the HA interconnect. The HA interconnect is a fifth Ethernet module, but it is reserved for communication between the two nodes of an HA pair, and is not available for host connections.

The maximum number of I/O modules, including both mandatory and optional I/O modules, supported in a system varies by configuration:

Single node: 10
HA: 10
DD Extended Retention: 10
DD Cloud Tier: 10
HA + DD Cloud Tier: 11

Three I/O module slots are tied to each CPU in the system. When installing I/O modules, balance the load across the CPUs. The following table shows the CPU to slot mappings.


CPU	I/O module slots
0	0, 1, 2
1	3, 4, 5
2	6, 7, 8
3	9, 10, 11

The following table assigns rules for populating the I/O modules.

Table 1. I/O module slot population rules
Step	I/O module type	Slots	Notes
1: Populate mandatory I/O modules	NVRAM	0
	Quad Port SAS	2
	Quad Port SAS	3
	Quad Port SAS	6
	Quad Port SAS	9	This slot remains empty if the system does not use DD Cloud Tier or DD Extended Retention.
	Quad Port 10GbE Optical	11	This slot remains empty if the system does not use HA.
2: Populate host interface I/O modules	Quad Port 10GbE SR Quad Port 10 GBase-T Dual Port 16 Gbps Fibre Channel	1, 4, 5, 7, 8, 10	Install host interface I/O modules in the remaining slots. Install the I/O modules to balance the load across the CPUs. Do not place two Ethernet or two FC I/O modules on one CPU.¹