N_Port ID Virtualization (NPIV) mode 1.3 Multipath I/O 1.3.1 AIX Path Control Module 22  IBM AIX Enhancements and Modernization In this mode, the cache device is available as a virtual Fibre Channel (FC) device on the AIX  LPAR. A cache pool can be created on the AIX LPAR on which only one cache partition may  be created. The cache partition can be used to cache any number of target devices on this  LPAR. Because the cache device is available from the SAN, the LPAR can be migrated to  another server. The cache device must be made visible on the target system. Caching can  continue to occur throughout the migration process, and the cache continues to stay  populated after the migration completes. In the following scenario, we have hdisk1 as a cache version, and hdisk2 as a target device.  Complete the following steps: 1. Create a cache pool and a cache partition, as shown in Example 1-15. 2. Assign the cache partition to target device hdisk2 in which we want to cache, as described  in Example 1-16. 3. Start caching on the target device and monitor the status, as shown in Example 1-17. # cache_mgt pool create -d hdisk1 -p pool1 # cache_mgt partition create -p pool1 -s 1000M -P part1 Example 1-15 Creating a cache pool and cache partition in an NPIV flash logical unit number Example 1-16 Assigning a cache partition to a target device that must be cached Example 1-17 Starting caching on a hdisk2 target and monitoring the status # cache_mgt partition assign -t hdisk2 -P part1 # cache_mgt cache start -t hdisk2 # cache_mgt monitor get –h -s Multipath I/O (MPIO) provides the ability for a device to be accessed through one or more  storage paths. To use MPIO, you need two main components: As of AIX 7.2 TL 3, the parallel SCSI, iSCSI, and FC disk device drivers and their device  methods support MPIO disk devices. In this section, we describe the AIX Path Control  Module (AIXPCM). GLYPH<SM590000> An MPIO-capable device driver that controls the target device. GLYPH<SM590000> A path control module (PCM) that provides path management functions. GLYPH<SM590000> Check the paths and determine which paths are usable for sending I/O. GLYPH<SM590000> Enable a path that was previously marked failed because of a temporary path fault. GLYPH<SM590000> Check unused paths that would be used if a failover occurred. The native AIXPCM performs path management functions and health checks. The health  check capabilities of AIXPCM allow it to: