Using Hitachi Device Manager, and after launching the Element Manager, you want to specify a logical device (LDEV) as a Command Device on a VSP storage system. Which two conditions must the LDEV…

Question

Options

• AThe LDEV must be at least 128 MB in size.
• BThe logical device must not be reserved for ShadowImage in-system replication.
• CThe emulation type must be OPEN-V.
• DThe logical device must not be on a RAID1 parity group.

• A
  4% (1)
• B
  92% (22)
• D
  4% (1)

Explanation

To designate an LDEV as a Command Device on a VSP system, it must use OPEN-V emulation (C) because Command Devices are open-system control volumes and Hitachi explicitly requires this emulation type - other open emulation types like OPEN-3 or OPEN-9 are not valid. Additionally, the LDEV must not be reserved for ShadowImage (B), because volumes committed to ShadowImage pair roles are already allocated for replication and cannot simultaneously serve as Command Devices.

Option A is wrong because the minimum size for a Command Device is approximately 48 MB, not 128 MB - 128 MB is a plausible-sounding distractor but doesn't match Hitachi's specification.

Option D is wrong because there is no restriction on RAID level for Command Devices; a volume on a RAID1 parity group is perfectly eligible, making this a red herring about hardware configuration.

Memory tip: Think "Open-V, Free from replication" - a Command Device must be Open and Free (not tied to ShadowImage). The "OF" pairing helps you recall both conditions quickly under exam pressure.

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