A client wants to add the Live Guest Relocation (LGR) feature to their IBM Z environment. Which of the following actions supports this requirement?

Question

Options

• AEnabling Single System Image (SSI) on z/OS v2.3 or newer
• BApplying the latest APAR to z/VM v5.4
• CEnabling Security Server on z/OS
• DEnabling Single System Image (SSI) on z/VM v6.4 or newer

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

Explanation

Note: The stated correct answer (A) appears to be incorrect based on IBM Z documentation. The actual correct answer is D.

Live Guest Relocation (LGR) is a z/VM feature - not a z/OS feature - that allows a running virtual machine (guest) to be moved between z/VM systems without interruption. LGR requires an SSI (Single System Image) cluster, which is a z/VM construct that links multiple z/VM systems into a cooperative cluster. SSI was introduced in z/VM 6.2, so z/VM 6.4 or newer (option D) satisfies the requirement.

Why the other options are wrong:

• A is wrong because SSI is a z/VM concept, not a z/OS concept - z/OS does not "enable SSI" to support LGR.
• B is wrong because z/VM 5.4 predates SSI support entirely (SSI arrived in 6.2), so no APAR can add the SSI infrastructure LGR depends on.
• C is wrong because the Security Server (RACF) on z/OS has no bearing on z/VM guest relocation.

Memory tip: Think "Live Guest = z/VM Guest" - the guest lives in z/VM, so the enabling feature (SSI) must also be in z/VM, not z/OS. The version floor is 6.2 (when SSI launched), so any option showing z/VM 6.x or higher is the right territory.

If your study material marks A as correct, I'd recommend verifying against the official IBM z/VM documentation - this appears to be an error in the question source.

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