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000-221 · Question #210

When migrating an LPAR utilizing Live Partition Mobility (LPM), which statement is correct?

The correct answer is C. Physical disk attributes for backing devices must have the same reservation policy set on both. For Live Partition Mobility, the SCSI reservation policy on physical backing devices must be identical on both the source and destination VIO Servers to prevent storage access conflicts after migration.

System Management

Question

When migrating an LPAR utilizing Live Partition Mobility (LPM), which statement is correct?

Options

  • AThe source and destination systems must be managed by different HMC devices.
  • BThe destination system must have the same virtual adapter slots free on its VIO Server as the
  • CPhysical disk attributes for backing devices must have the same reservation policy set on both
  • DLPARs with dedicated I/O adapters can be migrated using LPM, provided the same dedicated I/O

How the community answered

(58 responses)
  • A
    12% (7)
  • B
    5% (3)
  • C
    79% (46)
  • D
    3% (2)

Why each option

For Live Partition Mobility, the SCSI reservation policy on physical backing devices must be identical on both the source and destination VIO Servers to prevent storage access conflicts after migration.

AThe source and destination systems must be managed by different HMC devices.

LPM is explicitly designed to move LPARs between systems managed by the same HMC, so requiring different HMC devices contradicts the standard LPM architecture.

BThe destination system must have the same virtual adapter slots free on its VIO Server as the

LPM does not require that virtual adapter slot numbers on the destination VIO Server match those of the source - virtual adapters are remapped during the mobility operation.

CPhysical disk attributes for backing devices must have the same reservation policy set on bothCorrect

IBM requires that the reservation_policy attribute on physical disk backing devices be the same on both the source and destination VIO Servers before LPM can proceed. A mismatch - for example, no_reserve on one side and single_path on the other - can cause I/O errors or data integrity issues once the LPAR resumes on the destination system. This requirement is validated during the LPM pre-migration check and will block the operation if inconsistencies are found.

DLPARs with dedicated I/O adapters can be migrated using LPM, provided the same dedicated I/O

LPARs with dedicated physical I/O adapters cannot be migrated using LPM because dedicated hardware is bound to a specific physical system and cannot be transparently moved.

Concept tested: Live Partition Mobility storage reservation policy requirement

Source: https://www.ibm.com/docs/en/power10/9080-HEX?topic=mobility-live-partition-requirements-restrictions

Topics

#Live Partition Mobility#LPM#disk reservation policy#LPAR migration

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