A VSP customer wants to optimize their multi-pathing environment and improve I/O performance. Which two Hitachi Dynamic Link Manager (HDLM) features will assist this customer? (Choose two.)

Question

Options

• AHDLM spreads I/O workloads across available paths to ensure that no single path becomes
• BThe HDLM server monitors the client hosts' multi-pathing agents and redistributes I/Os so no
• CHDLM provides multiple load-balancing algorithms to balance I/Os across available paths.
• DHDLM analyzes I/O profiles and determines the most appropriate buffering policy.

• A
  88% (22)
• B
  8% (2)
• D
  4% (1)

Explanation

Options A and C are correct because HDLM is specifically designed as a host-based multi-pathing driver that (A) distributes I/O across all available paths to prevent bottlenecks on any single path, and (C) offers multiple load-balancing algorithms - such as Round Robin, Extended Round Robin, and Least I/Os - giving administrators flexibility to tune performance for different workload types.

Option B is wrong because HDLM has no "server" component that centrally monitors client hosts and redistributes I/O remotely; it operates locally on each host as a device driver, not as a centralized management agent.

Option D is wrong because automatic I/O profile analysis and buffering policy selection is not an HDLM function - HDLM focuses on path management and load balancing, not storage buffer tuning.

Memory tip: Think of HDLM as a traffic director on the host - it spreads traffic (A) and lets you choose how to spread it via algorithms (C). Anything involving a remote server managing clients (B) or auto-tuning buffers (D) is outside HDLM's scope.

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