Verifying cluster health is the absolute prerequisite before attempting any upgrade or maintenance activity.
An upgrade involves taking nodes offline (rebooting) sequentially. When a node goes offline, the cluster relies on the remaining nodes to serve I/O and maintain data redundancy.
If the cluster is already in a Degraded state (e.g., a drive is failed, or capacity is nearly full), taking a node offline could result in Data Unavailable (DU) or Data Loss (DL).
PowerFlex Manager and the CLI provide "Pre-upgrade Health Checks." These checks validate:
No active rebuilds or rebalances are running.
All SDS and MDM components are connected and synchronized.
There is sufficient spare capacity to handle a node failure or maintenance mode.
Resetting pools (Option A) creates data loss. Deduplication (Option C) is a feature choice, not an upgrade requirement.
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