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16 Dell HPC Omni-Path Fabric: Supported Architecture and Application Study June 2016
 Sweeping the fabric to discover topology changes, managing those changes when nodes are added
or deleted, etc.
 Adaptive routing
 Congestion Control
Subnet Administration
Subnet Administrator (SA) actively engages with Subnet Manager (SM) to store and retrieve the fabric
information. The SM/SA is single unified entity. With the help of SA messages, nodes connected to the fabric
can have node-to-node path information, fabric topology and configuration, event notifications etc.
Performance Manager
Performance Manager (PM) communicates with Performance Manager Agent (PMA) on each node of the
fabric to gain statistical information like link utilization bandwidth, link packet rates, link congestion, error
statistics (packet discards, packet routing errors etc.).
Performance Administration
Performance Administration (PA) actively engages with Performance Manager (PM) to store and retrieve
fabric performance information. The PM/PA is single unified entity. With the help of PA messages,
management nodes on the fabric can gain access to fabric information like overall health, fabric utilization,
packet information, counters and status for specific port etc.
Fabric Executive
Fabric Executive (FE) provides out-of-band access to the FM. It communicates with Fabric Manager GUI
over TCP/IP.
3.5.1 Embedded Subnet Manager
Embedded Subnet Manager (ESM) is a switch-based Subnet Manager which deploys all the FM components
as an embedded solution in an internally managed switch. ESM can manage small clusters (up to 128 nodes).
Embedded FM can be managed through CLI of the switch or through the chassis viewer of the switch.
Controlling Subnet Manager using Chassis Viewer
From the chassis viewer of the switch, click on “subnet manager” -> “control” to start/stop/restart the subnet
manager.