Why does the AFF-A800 show as Single-Path HA?

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Category:: aff-series

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Applies to

AFF-A800

Answer

An AFF-A800 system will show as Single-Path HA in sysconfig -a:

NetApp Release 9.7P4: Fri May 22 20:45:51 EDT 2020
System ID: 0123456789 (aff-a800-01); partner ID: 0123456780 (aff-a800-02)
System Serial Number: 952016000226 (aff-a800-01)
System Rev: C3
System Storage Configuration: Single-Path HA
System ACP Connectivity: Inband Active
SAS2/SAS3 Mixed Stack Support: all
All-Flash Optimized: true
Capacity Optimized: false
All SAN Array: false
Backplane Part Number: 1A21RNK00+A0
Backplane Serial Number: SHFGB00000000
.
.
slot 0: Virtual NVMe Host Adapter 0n
0    : NETAPP   X4014S173315TNTE NA50 14651.0GB 4160B/sect (S60SNE0N502096)
1    : NETAPP   X4014S173315TNTE NA50 14651.0GB 4160B/sect (S60SNE0N502044)
2    : NETAPP   X4014S173315TNTE NA50 14651.0GB 4160B/sect (S60SNE0N502050)
.
.
45   : NETAPP   X4014S173315TNTE NA50 14651.0GB 4160B/sect (S60SNE0N502046)
46   : NETAPP   X4014S173315TNTE NA50 14651.0GB 4160B/sect (S60SNE0N502043)
47   : NETAPP   X4014S173315TNTE NA50 14651.0GB 4160B/sect (S60SNE0N502045)
Shelf 0: FS4483PSM3E  Firmware rev. PSM3E A: 0120  PSM3E B: 0120

This is normal and due to the design of the system that utilizes a direct connection to the motherboard for the NVMe SSD devices installed in the internal shelf.
As such, there is no discrete Host Bus Adapter (HBA) with multiple ports required.
If an external shelf is connected to the on-board SAS ports, then the system will show as Multi-Path HA.

Additional Information

Note that the only supported external shelves to the AFF-A800 are:
- DS224C
- NS224
- DS2246 that has been upgraded with IOM12 shelf modules.