8.1 maxCache Limitations

  • maxCache is not supported on all Adaptec Smart Storage Controllers. For more information, see PMC-2153191 maxView Storage Manager and ARCCONF Command Line Utility Readme.
  • If the maxCache controller has a green backup module, the super capacitor must be fully charged.
  • Following are the limitations on maxCache device:
    • It must be created with SSDs
    • It must have logical block size of 512 bytes

    • Minimum maxCache device capacity is 16 GB

    • Maximum aggregate maxCache device sizes can be ~1.7TB for 64KB cache line size, ~6.8TB for 256KB cache line size.

  • Following are the limitations on the data logical device for which the maxCache device to be assigned:

    • It must have the capacity at least as large as the maxCache device
    • It must have logical block size of 512 bytes

    • Maximum data logical device size can be 256TB for the maxCache created with 64KB cache line size, 1024TB for the maxCache created with 256KB cache line size

    • For assigning maxCache to a SSD data logical device, SSD I/O bypass property should be disabled on the corresponding SSD data array

  • The following operations are not available when maxCache is enabled:
    • Expand Array/Logical Device
    • Move Logical Device
    • Replace Array Drives
    • Split Mirror
    • Heal Array
    • Migrate Array