NonStop S-Series System Expansion and Reduction Guide

ServerNet Worksheet: Tetra 8 Topology, X and Y Fabrics
Worksheet 9
With a highlighter, shade the enclosures, ports, and slot numbers that are in use in your current configuration.
With a pen, black out the enclosure you plan to remove.
Starting from the central “X” in this figure (representing the tetrahedral topology for the system), trace
all ServerNet cables to the ServerNet expansion boards (SEBs) or modular SEBs (MSEBs) in the processor
enclosures, and trace through all those SEBs or MSEBs to the I/O enclosures attached to the processor
enclosures. However, when you trace pathways to the remaining enclosures in your system, do not trace
through the blacked-out area. All pathways end when they reach that enclosure.
Circle all enclosures that are affected by the enclosure removal. List them in reverse numeric order, highest
to lowest. This is the order in which you will remove them from your system.
Group 01
5
4
6
1
2
3
50
50
PMF 50
50
50
Group 02
SEB
51
3
2
1
6
4
5
PMF 50
50
50
5
4
6
1
2
3
Group 03
PMF 50
SEB
51
5050
Group 04
PMF 50
SEB
51
5
4
6
1
2
3
X
Fabric
SEB
51
Group
11
IOMF
Group
12
IOMF
Group
22
IOMF
Group
21
IOMF
Group
31
IOMF
Group
32
IOMF
Group
42
IOMF
Group
41
IOMF
SEB
52
Group 01
5
4
6
1
2
3
55
55
PMF 55
55
55
Group 02
SEB
52
3
2
1
6
4
5
PMF 55
55
55
5
4
6
1
2
3
Group 03
PMF 55
SEB
52
55
55
Group 04
PMF 55
SEB
52
5
4
6
1
2
3
VST386.vsd
Y
Fabric
Group
31
IOMF
Group
32
IOMF
Group
42
IOMF
Group
41
IOMF
Group
11
IOMF
Group
12
IOMF
Group
22
IOMF
Group
21
IOMF
Note1 : This illustration shows the
maximum possible number of I/O
enclosures. Your service provider
can tell you the number of I/O
enclosures supported by your RVU.
Note 2: The router connections still
exist between the PMF CRU in slot
50 of each enclosure and the
processor in the PMF CRU in slot
55 of each enclosure. However, in
this figure they are not shown.
Enclosures to be Removed
(list in reverse numerical order)