Prerequisites for 3DC cascade

  • One VSP G800, VSP F800, VSP G1000, VSP G1500, or VSP F1500 is required for each site. HUS VM is not supported in 3DC cascade configurations.
  • If a site has multiple storage system, 3DC cascade cannot be configured.
  • RAID Manager is recommended at all the sites.
  • Device Manager - Storage Navigator is required at all sites.
  • The primary site requires the following:
    • Host application
    • TC
    • TC primary volume (P-VOL), the primary production volume
    • The TC P-VOL fence level (Primary Volume Fence Level) must be Secondary Volume Data.
  • The intermediate site requires the following:
    • TC
    • UR
    • TC S-VOL = UR P-VOL
    • UR master journal volume
  • The secondary site requires the following:
    • UR
    • UR S-VOL
    • UR restore journal volume
  • Differential data is used to resynchronize a suspended TC or UR pair.
  • When the TC pair is resynchronized, the UR pair in PAIR or COPY status is automatically split by the system.
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