Dell PowerEdge RAID Controller 10 User’s Guide PERC H345, H740P, H745, and H840 Series Controllers

The H745P MX is a RAID controller for the PowerEdge MX740c and MX840c compute sleds. It is used as an interface in a multipath topology with the MX5016s storage sled for the MX7000 modular system. The following illustration describes the multipath topology for the MX7000 modular system:

In this illustration, the H745P MX resides in the compute sled and functions as an interface to the SAS topology of the MX7000. The H745P MX is used to configure drives that are located in the MX5016s storage sled into RAID volumes. The H745P MX connects to a pair of MX5000s SAS I/O modules (IOMs) that manage connections between the compute and storage sleds in the MX7000. For more information about configuring drive assignments, see the www.dell.com/openmanagemanuals > OpenManage Enterprise Modular.

The H745P MX is connected to the SAS IOM, which in turn connects to one of the SAS expanders in the storage sled. The expander in the storage sled is then connected to all the physical drives in the storage sled, providing one path between the H745P MX and a physical drive in the storage sled. With connections to both SAS IOMs, the H745P MX has two paths to each drive in a storage sled allowing for a multi-path configuration. If either a SAS IOM or a SAS expander in the storage sled is removed, then a path to the physical drive is removed from the SAS topology.