System Partition Configuration

HBA Partition Configurations

Note: The HBA card exists within the storage controller, not the storage expander. It is listed here for configuration purposes.

HBA external ports order definition

There are 4 mini-SAS HD ports on each HBA, port A-D

See below for HBA mini-SAS HD ports order definition

The HBA can be designed in three configurations.

Note: Once connected, the HBA card will detect which configuration to use based whether all cables connect to the same Retimer card or to separate Retimer cards (a.k.a. IOM cards).

Configuration 1

The four external ports are set to two partitions.


Port A (1st four lanes)	PCIe x8	Partition 0: DSP #1
Port B (2nd four lanes)
Port C (1st four lanes)	PCIe x8	Partition 0: DSP #2
Port D (2nd four lanes)

Configuration 2

The 4 external ports are set to 1 partition. This is the default HBA partition setting.


Port A (1st four lanes)	PCIe x16	Partition 0: DSP #1
Port B (2nd four lanes)
Port C (3rd four lanes)
Port D (4th four lanes)

Configuration 3

The 4 external ports are set to 4 partitions.


Port A (1st four lanes)	PCIe x4	Partition 0: DSP #1
Port B (1st four lanes)	PCIe x4	Partition 0: DSP #2
Port C (1st four lanes)	PCIe x4	Partition 0: DSP #3
Port D (1st four lanes)	PCIe x4	Partition 0: DSP #4

SE4200 Partition Configurations

The SE4200 storage expansion supports three configurations. They are 1x16, 2x8 and 4X4. Each PCIe switch has x32 PCIe links on Upstream, each Retimer covers one of x16. Each x16 can be bifurcated into three CLS-specific configurations: 1x16, 2x8, and 4x4.

These configurations are statically written into SES firmware.

The mapping table is as follows：

CFG#1 is 4X4 configuration;
CFG#2 is 2X8 configuration;
CFG#3 is 1X16 configuration

Below are the canister PCIe partition configurations:

Figure 2. Canister PCIe partition configurations

Configuration #1 contains eight partitions. Each partition contains 1x4 USP and 3 SSDs with the default setting.

Configuration #2 contains four partitions. Each partition contains 1x8 USP and 6 SSDs with the default setting.

Configuration #3 contains two partitions. Each partition contains 1x16 USP and 12 SSDs with the default setting.

Default Port and SSD Assignments

Retimer Card Configuration

Note: The retimer card is also known as the "IOM" I/O MOdule, or "Pass-Thru Card". Up to two of these would be located in each SE4200 canister (4 per SE4200 storage expansion.)

The configuration (default 1x16) changes support by SES command in SES FW release (2.0.0), for 2x8 configuration commands, refer to the following:

Retimer: Update settings and get current configuration

Usage: retimer_cfg <args...>

<args>

get: Get the working mode of all currently loaded configurations of the retimer
set_all n: Set all retimer configurations to <0|1|2>(0: 1x16, 1: 2x8, 2: 4x4)
set c n: Set the <0|1> retimer configuration to <0|1|2> (0: 1x16, 1: 2x8, 2: 4x4)

Figure 4. Changing the retimer card configuration to 2x8

Figure 5. Check the current retimer card configuration

Celestica Documentation Portal