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Data storage for both the boot and application data is provided using a cut-through device (CTD), as shown in Figure 38, which acts like an HBA that accesses LUNs in the PowerMax. The CTD has two components to enable access to the LUNs through an FA/FN port. The first is the CTD Server thread. This runs on the FA/OR emulation and communicates with the CTD Client in the embedded operating system. The second is the CTD Client Driver. The CTD Client Driver is embedded in the host operating system and communicates with the CTD server running on the FA/OR emulation. An operating system running in a VM must have the CTD client driver installed to access the LUNs.
Embedded application ports are virtual ports specifically provided for use by the VMs that contain the applications, such as Cloud Mobility. They are addressed as ports 32 to 63 per director FA/OR emulation. The virtual ports are provided to avoid contention with physical connectivity. As with physical ports, LUNs can be provisioned to the virtual ports.