IBM DS4800 - Performing the DS4000 Health Check process

3. Repeat steps 1 on page 79 and 2 on page 79 for each additional redundant
host connection. You can create a maximum of four redundant host
connections, as shown in Figure 59.
Note:
Figure 59 shows that the DS4800 host ports are connected to four sets
of FC host bus adapters (HBAs). You can replace one or all of these sets
of FC HBAs with FC switches as required.
For examples of redundant, partially-redundant, and non-redundant host and drive
channel configurations, see “Fibre channel host loop configurations” on page 84.
Host A: Host adapter
2 (or from managed
hub or switch)
Controller B
Controller A
Host A: Host adapter
1 (or from managed
hub or switch)
ds48032
Figure 58. Location of host cables on RAID controllers
Host 1, Host Adapter 1 and 2
Host 4, Host Adapter 1 and 2
Host 2, Host Adapter 1 and 2
Host 3, Host Adapter 1 and 2
12 3 4
4
3
2
1
ds48057
Figure 59. Cabling diagram for four redundant host connections
80 IBM System Storage DS4800 Storage Subsystem: Installation, User’s, and Maintenance Guide