Which two Hitachi Dynamic Link Manager (HDLM) features address challenges associated with high availability and single point failures? (Choose two.)

Question

Options

• AHDLM provides failover protection by switching to a good path if a path fails.
• BHDLM monitors the paths of multiple hosts and redirects I/Os to the least busy path if a path fails.
• CHDLM can automatically set a failed path back online if it becomes available.
• DHDLM provides error correction algorithms that help recover data transmission errors caused by

• A
  88% (45)
• B
  8% (4)
• D
  4% (2)

Explanation

A and C are correct because they directly address the two core high availability challenges: eliminating single points of failure and ensuring self-healing recovery. Option A solves the "single point of failure" problem by automatically failing over I/O traffic to a healthy path when one path goes down. Option C solves the "recovery" challenge by automatically restoring a failed path once it becomes available again, without requiring manual intervention - critical for sustained high availability.

Why B is wrong: HDLM monitors paths on a single host, not multiple hosts. Cross-host path monitoring is not an HDLM function; that would be a fabric or storage array-level capability.

Why D is wrong: HDLM is a path management and multipathing solution - it does not perform error correction on data transmission. Data integrity/error correction is handled at lower layers (e.g., RAID, drive firmware, or protocol-level checksums).

Memory tip: Think of HDLM's two HA jobs as "dodge and recover" - it dodges failures by switching paths (A), and recovers by bringing paths back online automatically (C). If an option describes something a SAN switch or storage array does, it's probably a distractor.

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