Replace and evacuate data from devices

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When an IBM Cloud Object Storage Slicestor® device is replaced, its data can be evacuated to another device.

The device that is moved out of the storage pool is called the source device and the device that is moved into the storage pool is called the destination device. Before a source device is replaced, the following internal checks must pass:

  • A storage pool that contains the source and destination devices must be updated to ClevOS 3.4.0.0 or later.
  • The destination device must have a capacity equal to or greater than the source device.
  • The destination device must be reimaged if it previously contained data.
  • Both the source and destination device must not already be a part of an ongoing device replacement.
  • The replacement process must not impact vault health.
  • When a Slicestor® using the Concentrated Dispersal feature is being replaced in a Device Set, the Manager requires that the Slicestor must have twice as many disks than the (Widest Vault's IDA Width / Number of Slicestors in the Device Set).
Attention: Data cannot be evacuated during data reallocation. Before you perform an expansion, ensure that the system is in a healthy a state by doing maintenance tasks such as executing any planned data evacuations and replacing bad drives.

After data reallocation starts, drives can be replaced; however, devices that are replaced during data reallocation will not evacuate data. Do not replace devices during data reallocation because all data slices on the old device are lost.