User`s guide

240 XgOS User’s Guide • September 2014
The Oracle Fabric Interconnect also supports a decoupled Subnet Manager (SM),
which is part of a cluster environment. OFED 1.1 and 1.2 are supported on external
IB attached servers that run SM functions. See “OpenSM Decoupling” on page 244
for more information.
Xsigo Directory Service
The Xsigo Directory Service Daemon (XDSD) maintains a database of all the
reachable chassis and host servers in the cluster. XDSD runs as an instance on each
Oracle Fabric Interconnect and is enabled by default.
XDSD’ core functionality is to do the following:
■ Accept XCM records from each chassis XCM.
■ Accept requests from servers for XCM records.
■ Node name registration and query.
■ XDS election process.
When a Oracle host driver starts up, it has no information on where XDS is running.
However the driver does detect where the SM is running:
The SM can run on the Oracle Fabric Interconnect chassis or any external host server.
There is no requirement to run SM on an Oracle Fabric Interconnect chassis. See
“OpenSM Decoupling” on page 244.