Dell Unity: Loss of AC power scenario on Unity Arrays (User Correctable)
Summary: How the Unity array acts during a loss of AC power scenario.
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Instructions
Below is the scenario of A/C power loss for any Unity storage array:
- Any A/C power loss event of 10 ms or more leads to initiating a cache vault to the M2.SATA device, and results in the system shutting down
- Upon loss of A/C power, Storage Processors immediately reboot into low_power_mode, and while on battery, vault cache to the local M2.SATA drive. All CPU cores are shut down except one, and any other non-essential services are shut down during the vaulting process.
- Once the Vault is saved to /dev/vault, the system will shut down, or if A/C power has been restored before the system shuts off, the system will reboot and come online up in normal mode.
Affected Products
Dell EMC Unity FamilyProducts
Dell Unity 300, Dell EMC Unity 300F, Dell EMC Unity 400, Dell EMC Unity 400F, Dell EMC Unity 500, Dell EMC Unity 500F, Dell EMC Unity 600, Dell EMC Unity 600F, Dell EMC Unity Family |Dell EMC Unity All Flash, Dell EMC Unity Family
, Dell EMC Unity Hybrid
...
Article Properties
Article Number: 000019201
Article Type: How To
Last Modified: 11 Apr 2025
Version: 3
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