– Fibre Channel and Fibre Channel over Ethernet (FCoE) ports. If your system has an optionally
installed Fibre Channel and FCoE adapter for host and external storage attachment, ensure that
these ports are accessible.
Note: Some control enclosures do not support FCoE connections
– 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.
Combining 2U and 5U expansion enclosures
About this task
You can combine 2U and 5U 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 28 on page 54 shows example of different combinations of SAS weights.
Table 28. Example combinations of supported SAS chains and expansion enclosures
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 location and orientation of the Input and Output SAS ports on the 2U and 5U SAS
enclosures differs. Figure 51 on page 54 shows the SAS ports on the 2U and 5U expansion enclosures.
Figure 51. SAS port orientation on expansion enclosures
1 Input SAS port
2 Output SAS port
54
IBM FlashSystem 5000 : FlashSystem 5000 Quick Installation Guide
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