Dell PowerVault MD1120 - Manual (Page 22)

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Operating Your Storage Enclosure
• A split-mode configuration is one in which your storage enclosure is
connected to either two host controllers, or two ports on a single host
controller. In this configuration, the physical disks are split into two groups
with 12 physical disks controlled by one host controller and 12 physical
disks controlled by the other host controller. See Figure 2-2 and Figure 2-3
for a cabling diagram of a split mode configuration.
NOTE:
Daisy-chaining storage enclosures is not supported in split mode.
NOTE:
Clustering is not supported in the MD1120 host-based RAID solution.
Selection of the configuration mode is done via the enclosure mode switch on
the front enclosure panel (see Figure 1-2).
NOTE:
The enclosure mode switch must be set to the mode you want to use before
the enclosure is powered on. Changing the configuration selection after the
enclosure is powered on has no effect on enclosure operation until it is rebooted.
Connecting the Enclosure
1 Confirm that the latest version of Server Administrator is installed. For
installation instructions and supported operating systems, see your Server
Administrator documentation.
2 Turn off the host system and all attached devices.
3 Connect the external SAS cable(s) to the EMM SAS connector on the
storage enclosure (see Figure 1-5 and Figure 2-1) and to the RAID
controller on the host system. (See your RAID controller documentation
to ensure that the controller is properly installed.)
•
If you are configuring your enclosure in unified mode (Figure 2-1 and
Figure 2-4), connect the external SAS cable from the host controller to
the In port on the primary EMM module of the first enclosure in the
daisy chain. Attach subsequent storage enclosures in the daisy chain
to the Out port on the first upchain storage enclosure. The last
enclosure in the chain will not have a connecting cable in its Out
EMM port.
• If you are configuring your enclosure in split mode (Figure 2-2 and
Figure 2-3), attach the external SAS cable from the first host
controller to the In port on the primary EMM module and the SAS
cable from the second host controller or port to the In port on the
secondary EMM. In this configuration, the server attached to the In