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What is the ONTAP e0S interface?

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Applies to

  • AFF A900
  • AFF A800, AFF C800
  • AFF A700s
  • AFF A400, AFF C400
  • AFF A320
  • AFF A250, AFF C250
  • FAS9500
  • FAS8700
  • FAS8300
  • FAS500f
  • FAS2820

Answer

The e0S interface is an interface in newer FAS and AFF storage systems.

Conceptually, e0S is an ONTAP interface on a node that is used for internal communication with its service processor (SP) or baseboard management controller (BMC).

  • It is auto-configured with hard-coded IP addresses in the 192.0.2.x subnet.
  • On most platforms, it is used for SP/BMC firmware updates and error condition reporting directly between the SP/BMC and ONTAP internally
  • On many BMC-based platforms, this internal subnet is used for HW-assisted storage failover, as well (since both nodes' e0S interfaces and BMCs can see each other internally).
Details
  • A private and internal Ethernet-switched subnet exists between both ONTAP HA partners and both BMCs:
    • ONTAP interface: e0S
    • BMC interface: Either eth0 or eth1, depending on the platform model
  • Uses subnet 192.0.2.0/24 with statically-assigned IP addresses for all interfaces
  • Features such as HW-assisted failover, ONTAP <-> BMC communications (IPMI), and BMC FW updates are performed over this private network
  • Boot media replacements for these platforms will use the e0S IP address for the system node restore-backup command
  • HW-assisted takeover is not configurable – it uses statically-assigned addresses (see the table, below)

The IP addressing is static and automatically configured on all related Ethernet interfaces:

Controller e0S Address/Mask BMC Address/Mask
A 192.0.2.84/24 192.0.2.81/24
B 192.0.2.85/24 192.0.2.82/24

Additional Information

What is the ONTAP e0M-16 interface?

 

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