A customer wants to create a multi-path environment for a specific Redhat Linux application on a Hitachi Unified Storage system. They have created Host Groups on all of the available ports and…

Question

Options

• ADevice Mapper
• BMultipath I/O (MPIO)
• CHitachi Dynamic Link Manager
• DMultiplexed I/O (MPxIO)

Explanation

Device Mapper (A) and Hitachi Dynamic Link Manager (C) are the two correct answers for active/active multipath on Red Hat Linux with Hitachi Unified Storage.

Device Mapper (dm-multipath) is the native kernel-level multipath framework built into Red Hat Linux, and it supports active/active configurations by load-balancing I/O across multiple paths simultaneously. Hitachi Dynamic Link Manager (HDLM) is Hitachi's proprietary multipath software designed specifically for Hitachi storage systems, and it also supports active/active connectivity on RHEL with advanced path management features like load balancing and failover.

MPIO (B) is Microsoft's Multipath I/O framework - it is a Windows Server technology and has no role on Red Hat Linux systems. MPxIO (D) is a Solaris/Sun technology (also called STMS - Sun Traffic Manager), built into Oracle Solaris for multipath management; it does not apply to Red Hat Linux environments.

Memory tip: Think OS ownership - Device Mapper = Linux, HDLM = Hitachi's own tool. Eliminate B (Microsoft = Windows) and D (MPxIO = Sun/Solaris). When the question specifies a vendor's storage system, the vendor's own pathing software is almost always one of the correct choices.

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