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Why can the cloud tiered data copy from the local tier after the Cloud IC LIFs down?

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Applies to

  • ONTAP 9
  • FabricPool
  • Cloud Intercluster (IC) LIFs down
  • The imparied volume tiering policy is all

Answer

  • The data can still be read even though the Cloud Intercluster (IC) LIFs are down because the SSD blocks have not been reused yet.
  • When ONTAP tier data, ONTAP tier from the volume’s container file. Files inside the volume still have the old SSD blocks address in their indirect blocks.
  • When a read OPs comes in, WAFL first tries to use that SSD address. If SSD still has the block, all the context checks succeed and ONTAP uses that data to serve the read request. If the block has been reused, context checks fail and ONTAP redirects the read to the new cloud address ONTAP stored in the container file.
  • So it's expected behavior that the data can copy from the local tier when the IC LIFs are down as the volume still has the old SSD blocks address in their indirect blocks.

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