Faster disk space calculation for upload heavy instances

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Do you have a rough idea how long the du was taking for you? I’m not really keen on this approach to resolve the performance issue and I think there are two alternatives:

  1. Just use Upload.sum(:filesize).to_i + OptimizedImage.sum(:filesize).to_i to determine uploads_used_bytes like how we do for external stores.
  2. Introduce a background job that periodically recalculates the bytes used by uploads and cache it in Redis.

Personally, I’m more keen on (1) as it is a much simpler solution. We do lose some accuracy but we don’t need 100% accuracy here. Still it will be much better than the approximation we get from df.

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