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|Sun ZFS Storage 7120, 7320, and 7420 Appliance Installation Guide|
The Sun ZFS Storage 7420 supports from two to six HBA cards, each of which connects to a chain of up to six disk shelves. The figures below show a subset of stable, balanced configurations with two HBAs, as well as steps to migrate from one state to another.
Note: Location of HBAs in the diagrams below are not representative. Refer to the PCIe Options of your appliance model's Hardware Maintenance Overview for proper slot allocation.
fig.1 Sun ZFS Storage 7420 with two HBAs and one disk shelf
fig.2 Sun ZFS Storage 7420 with two HBAs and two disk shelves
fig.3 Sun ZFS Storage 7420 with two HBAs and four disk shelves
fig.4 Sun ZFS Storage 7420 with two HBAs and 12 disk shelves