– Ethernet ports, including the technician port. The technician port is used for initial setup of the
system by directly attaching to a personal computer. It can also be used to complete service actions
for the system.
– USB ports.
– Fibre Channel ports. If your system has an optionally installed Fibre Channel adapter for host and
external storage attachment, ensure that these ports are accessible.
– The nodes and the enclosures themselves. Access is required to the hardware for servicing and for
safely removing and replacing components by using two or more people.
Procedure
1. Install the cables, as shown in Figure 54 on page 45.
Note: Figure 54 on page 45 shows the cable connections between the SAS enclosures and the
control enclosure. It does not imply or represent the precise racking order for the enclosures in a rack.
However, due to its size and weight, always place the 5U enclosure near the bottom of the rack.
Figure 54. Connecting the SAS cables
2. If more I/O groups are configured, repeat the cabling procedure for the other I/O groups. Each system
can have a maximum of four I/O groups, with two chains of expansion enclosures attached to each I/O
group. Two chains of expansion enclosures can be attached to each I/O group. On each SAS chain, the
systems can support up to a SAS chain weight of 10.
Combining 2U and 5U expansion enclosures
About this task
You can combine 2U and 5U expansion enclosures in a SAS chain. The limiting factor is the combined
chain weight of the various components. The maximum SAS chain weight that can be attached to a node
SAS port is 10:
• 5U expansion enclosures have a chain weight of 2.5
• 2U expansion enclosures have a chain weight of 1.
Example
Table 11 on page 45 shows example of different combinations of SAS weights.
Table 11. Examples of supported SAS chain combinations
2U Enclosures (12
drives)
2U Enclosures (24
drives)
5U Enclosures (92
drives)
Combined chain weight
2
0
3
9.5
2
3
2
10
0
7
1
9.5
1
1
1
4.5
In addition, the orientation of the Input and Output SAS ports on the 2U and 5U SAS enclosures differs.
Figure 55 on page 46 shows the SAS ports on the 2U and 5U expansion enclosures.
Chapter 2. Installing the system hardware 45
Summary of Contents for Storwize V5100 Series
Page 129: ......
