Dell PowerVault MD1120 Hardware Owner's Manual page 17

controlled by the secondary (right) EMM. You must select either mode using
the enclosure mode switch on the front panel of the enclosure before
powering on (see Figure 1-2).
NOTE:
Clustering is not supported in the MD1120 host-based RAID solution.
Figure 1-6 illustrates the division of control, depending on whether you select
the enclosure to run in either unified or split mode.
Figure 1-6. Physical Disk Slot Distribution in Split Mode vs. Unified Mode
NOTE:
To change the enclosure mode, you must change the position of the
enclosure mode switch before you power on the enclosure. Changing the position
of the switch while the enclosure is on will not affect enclosure operation until the
enclosure is rebooted.
For a complete description of the roles of the primary and secondary EMMs,
see "Operating Your Storage Enclosure" on page 21.
EMM Control in Split Mode
EMM Control in Unified Mode
About Your System
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