20 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 drives are split into two
groups with eight drives controlled by one host controller and seven drives controlled by the other host
controller. See Figure2-1 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 Figure1-7).
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
Figure1-5 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
Figure2-1). Attach subsequent storage
enclosure
s 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 Figure2-1. In single-host configuration, you can cable both EMMs to either the same host controller, or to
a separate host controller.