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E – Glossary
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SDP For Sockets Direct Protocol. An InfiniBand-specific
upper layer protocol. It defines a standard wire protocol
to support stream sockets networking over InfiniBand.
SRP For SCSI RDMA Protocol. The implementation of this
protocol is under development for utilizing block
storage devices over an InfiniBand fabric.
SM For Subnet Manager. A subnet contains a master
Subnet Manager which is responsible for network
initialization (topology discovery), configuration, and
maintenance. The Subnet Manager discovers and
configures all the reachable nodes in the InfiniBand
fabric. It discovers them at switch startup, and
continues monitoring changes in the physical network
connectivity and topology. It is responsible for assigning
local identifiers, called LIDs, to the visible nodes. It also
handles multicast group setup. When the network
contains multiple managed switches, they negotiate
among themselves which will be the controlling Subnet
Manager. It communicates with the SMAs that exist on
all nodes in a cluster.
SMA For Subnet Management Agent. SMAs exist on all
nodes, and are responsible for interacting with the
subnet manager to configure an individual node and
report node parameters and statistics.
subnet A single InfiniBand network.
switch Used to connect HCAs and TCAs. Packets are
forwarded from one port to another within the switch,
based on the LID of the packet. The fabric is the
connected group of switches.
TCA For Target Channel Adapter. A TCA is a channel
adapter for I/O nodes, such as shared storage devices.
TCP For Transmission Control Protocol. One of the core
protocols of the Internet protocol suite. A transport
mechanism that ensures that data arrives complete and
in order.
TID For Token ID. A method of identifying a memory region.
Part of the InfiniPath hardware.
uDAPL For user Direct Access Provider Library. uDAPL is the
user space implementation of the DAPL protocol.
unmanaged switch A switch that does not have an active Subnet Manager
(SM).