Cabling Stretch Metroclusters - IBM N series Hardware Manual
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Mixed SATA and FC configurations are allowed if the following requirements are met:
– There is no intermixing of Fibre Channel and SATA shelves on the same loop.
– Mirrored shelves must be of the same type as their parents.
The Stretch MetroCluster heads can have a distance of up to 500 m (@2 Gbps). Greater
distances might be available at lower speeds (check with RPQ/SCORE). Qualified distances
are up to 500 m. If you have distances greater than 500 m, choose Fabric MetroCluster.
Table 8-2 lists theoretical Stretch MetroCluster distances.
Table 8-2 Theoretical MetroCluster distances in meters
Data Rate in Gbps
1
2
4
Remember: The following maximum distances are supported for Stretch MetroCluster:
2 Gbps: 500 m
4 Gbps: 270 m
8 Gbps: 150 m
8.3.2 Cabling Stretch MetroClusters
Figure 8-5 shows a Stretch MetroCluster with two EXN4000 FC shelves on each site.
Figure 8-5 Stretch MetroCluster cabling with EXN4000
OM-2 (50/125um)
OM-3 (50/125um)
500
860
300
500
150
270
OM-3+
1130
650
350
Chapter 8. MetroCluster
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