NonStop S-Series Planning and Configuration Guide (G06.29+)

ServerNet Communication Pathways
HP NonStop S-Series Planning and Configuration Guide—523303-021
6-9
SEBs, MSEBs, and Communication Pathways
SEBs, MSEBs, and Communication Pathways
Communication pathways between enclosures are provided by SEBs (or MSEBs).
Each SEB in an enclosure connects to one fabric. If you remove an SEB from any
processor enclosure, the enclosures and their devices that were connected to that SEB
are no longer accessible to the rest of the system.
This subsection describes these pathways and the consequences of losing an SEB.
SEB Pathways Within One Enclosure
SEBs or MSEBs can occupy slots 51 through 54 in inner tetrahedron processor
enclosures and slots 51 and 52 in outer tetrahedron processor enclosures.
SEBs provide a gateway from one processor enclosure to another. The router inside
an SEB provides pathways between all ports within the SEB and to its related PMF
CRU. The ports on an SEB can communicate with each other in the absence of its
related PMF CRU.
The heavy lines in the following figure show a pathway:
•
From Group 01 to PMF CRU 50
•
From IOMF Group 52 to PMF CRU 50
•
From Group 01 to I/O Group 52
SEB Pathways Within One Enclosure
6-9
SEB Pathways Within One Enclosure: One SEB Removed 6-10
SEB Pathways Between Enclosures 6-11
SEB Pathways Between Enclosures: One SEB Removed 6-12
SEBs in Slots Communicate with
51, 53 X fabric
52, 54 Y fabric
VST933.vsd
Slot
53
SEB
51
Group 05
1
2
3
4
6
5
50
Group
51
IOMF
50
Group
52
IOMF
50
Group
53
IOMF
50
Group
54
IOMF
PMF 50
(to PMF 55)
X Fabric
Router
To Group 01