QLogic OFED+ Host Software User Guide, Rev. B

3–TrueScale Cluster Setup and Administration
QLogic Distributed Subnet Administration
In Figure 3-8, the Distributed SA assigns all overlapping SIDs to the "PSM_MPI"
fabric because it has the lowest Index
NOTE:
The Distributed SA makes these assignments not because they are right,
but because they allow the fabric to work even though there are errors. The
correct solution in these cases is to redefine the fabric so that no node will
ever be a member of two Virtual Fabrics that service the same SID.
Distributed SA Configuration File
The Distributed SA configuration file is
/etc/sysconfig/iba/qlogic_sa.conf. It has several settings, but normally
administrators will only need to deal with two or three of them.
SID
The SID is the primary configuration setting for the Distributed SA, and it can be
specified multiple times. When the Distributed SA starts, it loads information about
the Virtual Fabrics specified by the Fabric Manager and each SID is mapped to a
single virtual fabric. Multiple SIDs can be mapped to the same virtual fabric. The
default configuration for the Distributed SA includes all the SIDs defined in the
default Qlogic FM configuration for use by MPI.
The SID arguments have a very particular logic that must be understood for
correct operation. A SID= argument defines one Service ID that is associated with
a single virtual fabric. In addition, multiple SID= arguments can point to a single
virtual fabric. For example, a virtual fabric has three sets of SIDs associated with
it: 0x0a1 through 0x0a3, 0x1a1 through 0x1a3 and 0x2a1 through 0x2a3. You
would define this as
SID=0x0a1
SID=0x0a2
SID=0x0a3
SID=0x1a1
SID=0x1a2
SID=0x1a3
SID=0x2a1
SID=0x2a2
SID=0x2a3
NOTE:
A SID of zero is not supported at this time. Instead, the OPP libraries treat
zero values as "unspecified".
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