Hitachi Dynamic Link Manager is being used with a VSP system in a multi-path environment with intense sequential I/Os. What are two Hitachi recommended load- balancing algorithms for this…

Question

Options

• ALeast I/O
• BLeast Block
• CExtended Least I/O
• DExtended Round Robin

• A
  16% (4)
• B
  8% (2)
• C
  76% (19)

Explanation

In HDLM, the two "Extended" algorithms - Extended Least I/O and Extended Round Robin - are specifically engineered to account for I/O block sizes, not just I/O counts, making them far more effective when workloads consist of large, sequential I/Os that would otherwise skew path utilization. The basic Least I/O (A) algorithm only counts queued I/Os without weighing their size, so it can send a path a small random I/O and a massive sequential I/O with equal weighting - a poor fit for sequential-heavy environments. Least Block (B) counts queued blocks rather than I/Os, but it is also a basic algorithm and is not among Hitachi's recommended choices for sequential workloads on VSP systems.

Memory tip: Think "Extended = Sequential" - if the exam mentions intense sequential I/O, both correct answers will have "Extended" in their name. The "Extended" prefix is Hitachi's signal that the algorithm has been enhanced to handle workload size, not just workload count.

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