Details on EMC’s V-Max Virtual LUN Technology Enhancements

Virtual LUN Technology

The Symmetrix V-Max storage array enhances the Virtual LUN technology offered by DMX storage arrays. The Virtual LUN technology on the V-Max array can now perform transparent, nondisruptive data mobility between storage tiers for standard Symmetrix devices. This technology is based on the Enginuity Virtual RAID Architecture and requires Enginuity code level 5874. Virtual LUN migration provides users the ability to move data between high-performance drives and high capacity drives. This new functionality is used to either change RAID protection types, move between physical disk groups, or both. It supports the migration of regular devices or meta-volumes, and can utilize configured or unconfigured disk space as the target. When the migration is performed to configured space, the target of the invocation cannot be assigned to a host. Migration is facilitated by the creation and movement of Symmetrix devices. Upon completion of the migration, the original devices are deleted and the space is freed.

Rules regarding Virtual LUNs

  • Enhanced Virtual LUN Technology works with all EMC replication technologies including SRDF, TimeFinder, and Open Replicator.
  • Migrations of devices can only occur inside a single V-Max system.
  • Once established, migrations cannot be canceled.
  • Protected devices cannot be moved to unprotected devices.
  • Target devices have to be unmapped and/or unmasked before they can be used for a VLUN migration session.
  • Only one migration operation can be executed on any device at one time.
  • Migrations are managed as a session. Once the session is established, migration is monitored and managed by the assigned session name.
  • Multiple migrations can be run in parallel sessions, with a maximum of 16 sessions.
  • RDF devices cannot be specified as the target for a migration to configured space.

From “EMC Symmetrix V-Max and VMware Virtual Infrastructure – Applied Technology” (EMC Copyrighted) Found at


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  • tsa

    With all due respect, the document referenced is indeed Copyrighted (c) 2009, EMC Corporation, as noted in the very first sentence on page 2.

  • Tom

    Seems like VLUN runs faster on V-Max…no doubt about that. What about the claim of being able to run 1000 concurrently on V-Max. Is it substantiated? Where's the challenge to EMC? Having worked there, I believe EMC…but it would be great to see some substantiation of claims and proof of this marketing analysis support. StorageMonkeys may be correct in the vetting of analysis and marketing.

  • I noticed that also — the 1000s vs the 16 sessions. Have to probe further

  • I noticed that also — the 1000s vs the 16 sessions. Have to probe further