EMC VNX BBU compared to CX3 and CX4 SPS

EMC CX Series SPS (Standby Power Supply) Units:

  1. EMC SPS 078-000-062 (CX and CX3 Series):
    • Type: Standby Power Supply (SPS).
    • Wattage: 1000W.
    • Compatibility: Works with older EMC CX and CX3 series arrays.
    • Function: Provides backup power to ensure data is written from cache to non-volatile storage during power failures.
    • Limitations: Not compatible with the CX4 or VNX1 series due to lower wattage (1000W vs. 1200W for newer units).
  2. EMC SPS 078-000-064 (CX4 Series):
    • Type: SPS for CX4 series.
    • Wattage: 1200W.
    • Compatibility: Supports CX4 series and is backward compatible with CX and CX3 series arrays. However, CX and CX3 series SPS units (1000W) cannot be used with CX4 arrays due to the power demands.
    • Advancement: Provides increased wattage over the previous generation for higher-performance CX4 arrays.
  3. EMC SPS 078-000-085 (VNX1 Series):
    • Type: SPS for VNX1 series.
    • Wattage: 1200W.
    • Compatibility: Fully compatible with VNX1 and CX4 series arrays and backward compatible with CX and CX3, similar to the CX4 SPS units. The wattage (1200W) allows it to meet the higher power demands of the VNX1 arrays.

EMC VNX Series BBU (Battery Backup Unit) Models:

  1. EMC BBU 078-000-132-00 (VNX2 Series):
    • Type: Battery Backup Unit (BBU).
    • Compatibility: Designed for the VNX2 series (e.g., VNX5200, VNX5400, VNX5600).
    • Capacity: The rated watt-hour (Wh) charge capacity is identical to the 078-000-092-07 model.
    • Function: Provides short-term power to ensure data in volatile memory (cache) is safely written to non-volatile storage during a power loss.
    • Part Number Variation: The part number difference from the 078-000-092-07 is likely due to a supplier change or minor component-level variation, as both models have the same rated performance.
  2. EMC BBU 078-000-092-07 (VNX2 Series):
    • Type: BBU.
    • Compatibility: Also supports the VNX2 series arrays.
    • Functionality: Identical to the 078-000-132-00 BBU in terms of battery capacity, power delivery, and function. The part number variation likely reflects a different battery supplier or component change within the bill of materials (BOM), without affecting overall performance or specifications.

Clarifications and Key Insights:

  • Generational Compatibility: The CX and CX3 series SPS units are limited to 1000W and are not compatible with the more demanding CX4 and VNX1 systems, which require 1200W SPS units. The VNX1 SPS units are backward-compatible with CX4, CX3, and CX systems, offering flexibility across these product lines.
  • BBU Part Number Differences: The VNX2 BBUs (078-000-132-00 and 078-000-092-07) are functionally identical, with part number changes likely due to internal sourcing or component-level shifts, such as changes in the supplier of the lithium-ion battery. These changes do not affect the rated capacity or performance of the units.