Transparent cloud tiering maximum limitations and configuration

Transparent cloud tiering on the system is defined by configuration limitations and rules.

The system restrictions specific to transparent cloud tiering for this release follow.

  • One cloud account per system.
  • A maximum of 1024 volumes can have cloud-snapshot enabled volumes.
  • The maximum number of active snapshots per volume is 256.
  • The maximum number of volume groups is 512.
  • Cloud volumes cannot be expanded or shrunk.
  • A volume cannot be configured for a cloud snapshot if any of the following conditions are valid:
    • The volume is part of a remote copy relationship (Metro Mirror, Global Mirror, active-active) master, auxiliary, or change volume. This configuration prevents the cloud snapshot from being used with HyperSwap® volumes.
    • The volume is a VMware vSphere Virtual Volumes volume, including FlashCopy® owned volumes that are used internally for Virtual Volumes restoration functions.
    • The volume is a file system volume.
    • The volume is associated with any user-owned FlashCopy maps.
    • The volume is a mirrored volume with copies in different storage pools. A side effect of this restriction is that it prevents the cloud snapshot from being used for stretched volumes in stretched topology systems.
    • The volume is being migrated between storage pools.
  • A volume cannot be enabled for cloud snapshots if the cloud storage is set to import mode.
  • A volume cannot be enabled for cloud snapshots if the maximum number of cloud volumes exists. The maximum number of cloud volumes on the system is 1024. If the system exceeds this limit, you can disable cloud snapshots on an existing cloud volume and delete its associated snapshots from the cloud storage to accommodate snapshots on new cloud volumes.
  • A volume cannot be used for a restore operation if the following conditions are valid:
    • A Virtual Volume, including FlashCopy volumes that are used internally for Virtual Volumes restoration functions.
    • A file system volume.
    • Part of a remote copy relationship (Metro Mirror, Global Mirror, active-active) master, auxiliary, or change volume.
  • A volume that is configured for backup or is being used for restoration cannot be moved between I/O groups.
  • Only one operation (cloud snapshot, restore, or snapshot deletion) is allowed at a time on a cloud volume.
  • Cloud volume traffic is allowed only through management interfaces (1 G or 10 G).
Parent topic: Configuring transparent cloud tiering