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Dell Unity™ Family Unisphere® Command Line Interface User Guide

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Manage LUN Move sessions

Use the LUN Move feature when you need to move existing LUNs in the system, such as between pools for load balancing, to take advantage of newly purchased spindles, or to enable data reduction (for either newly-written data or both newly-written data and existing data) on a thin LUN in an All Flash pool. Note that if you choose to apply data reduction to existing data, the LUN data is moved within the same pool.

If you move a LUN that:

  • Has not had data reduction applied, it is moved as uncompressed.
  • Has had data reduction applied, and it is being moved to an All Flash pool, it is moved as compressed. If you are not moving it to an All Flash pool, it is moved as uncompressed.
  • Not thin, it is moved as not thin.
  • Thin, it is moved as thin.

The following table lists the attributes for moving LUNs:

Table 1. LUN move attributes
Attribute Description
ID ID of the move session.
Source resource Storage resource for the source.
Source member LUN Source member LUN, if the storage resource is a LUN group.
Destination pool Pool for the destination.
State Current state that represents the lifecycle of a move session. Value is one of the following:
  • Initializing—Move session is in the process of initializing.
  • Queued—Move session is queued to run. The system begins the data transfer when sufficient resources are available.
  • Running—Indicates that the move session is transferring data.
  • Failed—Move session has failed. Consult the move session's health for more details.
  • Cancelling—Indicates that the move session is in the process of being cancelled.
  • Cancelled—Indicates that the move session has been cancelled.
  • Completed—Data transfer for the move session has completed.
Progress Progress of the move session expressed as a percentage.
Health state Health state of the move session. Value is one of the following:
  • Unknown—The move session health cannot be determined.
  • OK—The move session is operating normally.
  • Major failure—One of the following:
    • The pool went offline and the move cannot continue. Please remove the move session, address the issue, and recreate the move session.
    • The pool exhausted the space available and the move cannot continue. Please remove the move session, address the issue, and recreate the move session.
    • The move session encountered an internal error. Please contact your service provider.
Health details Additional health information. See Appendix A, Reference, for health information details.
Priority Priority for the move session. Value is one of the following:
  • Idle—No copy I/O generated. The move session continues to mirror host I/O.
  • Low—Designated for move sessions that have the least priority over other move sessions.
  • Below normal—Designated for move sessions that are slightly less critical than the average or normal move session.
  • Normal—Designated for move sessions that are appropriate for most use cases. This is the default value.
  • Above normal—Designated for move sessions that are slightly more critical than the average or normal move session.
  • High—Designated for move sessions that take the highest priority over other move sessions.
Average transfer rate Average transfer rate of the move session in MB/sec.
Current transfer rate Current transfer rate of the move session in MB/sec.
Estimated time left Estimated time remaining in seconds based on the current transfer rate.

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