Dell PowerVault MD1000 Hardware Owners Manual - Page 20
Connecting the Enclosure, Out EMM port. - server raid controller
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• 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 drives are split into two groups with eight drives controlled by one host controller and seven drives controlled by the other host controller. See Figure 2-1 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 MD1000 host-based RAID solution. Selection of the configuration mode is done via the enclosure mode switch on the front enclosure panel (see Figure 1-7). 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, connect the external SAS cable from the host controller to the In port on the EMM module of the first enclosure in the daisy chain (see Figure 2-1). 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, 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 (see Figure 2-1). In this configuration, the server attached to the In port on the primary EMM will control eight drives (slots 7 through 14); the server or controller port attached to the In port on the secondary EMM will control seven drives (slots 0 through 6). NOTE: In split mode, you can cable the enclosure to operate in either a two-host or single-host configuration. See Figure 2-1. In single-host configuration, you can cable both EMMs to either the same host controller, or to a separate host controller. 20 Operating Your Storage Enclosure