Explanation: When configuring a chain with ES40 SAS shelves and DS60 shelves in a PowerProtect DD environment, the maximum allowable number of shelves on that chain is three. This limitation is due to compatibility and bandwidth requirements for maintaining optimal performance and reliability across the SAS chain. Mixing different shelf models (ES40 and DS60) in a single chain affects the maximum supported configuration, and following this limitation ensures that the data transfer speeds and stability are not compromised.
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