Which two Program Products reserve cache in a Hitachi Unified Storage system when they are installed, even if disabled? (Choose two.)

Question

Options

• ATrueCopy
• BCache Partioning Manager
• CShadowImage
• DTrueCopy Extended

Explanation

TrueCopy (A) and ShadowImage (C) are the two products that reserve cache upon installation, even when disabled.

Both TrueCopy and ShadowImage are replication-based Program Products that require dedicated cache segments to support their differential/tracking tables and staging operations. The Hitachi Unified Storage architecture pre-allocates this cache at installation time so the system is immediately ready to perform replication operations when enabled - the reservation is tied to the license install, not the active use of the feature.

Cache Partitioning Manager (B) is a cache management tool that divides existing cache into logical segments for workload isolation - it consumes no additional cache of its own and doesn't pre-reserve any. TrueCopy Extended (D) is an extension license for long-distance asynchronous replication; it relies on TrueCopy's already-reserved cache rather than reserving its own independent cache pool.

Memory tip: Think of it as "replication needs a staging area ready to go." The two standalone replication engines - local (ShadowImage) and remote (TrueCopy) - each claim their cache slice at install time, like reserving a locker before you start using it.

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