58 lines
2.1 KiB
YAML
58 lines
2.1 KiB
YAML
---
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last_verified: 2026-03-14
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description: ADB-S auto-scaling behavior, timing, and sizing implications.
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---
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auto_scaling:
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ocpu_scaling:
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trigger: "CPU demand exceeds current allocation"
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max_scale: "3x base OCPUs (up to 128 OCPU maximum)"
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ramp_up_time: "2-3 minutes to begin scaling"
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ramp_down_time: "After sustained low utilization (5-10 minutes)"
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billing: "Only billed during active scaling period, per OCPU per second"
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storage_scaling:
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trigger: "Storage usage approaches allocated storage"
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behavior: "Auto-expands storage allocation"
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billing: "Billed for allocated storage"
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sizing_recommendations:
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base_ocpu_strategy: |
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Size base OCPUs for P75 utilization, not average.
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Auto-scaling handles P95+ bursts, but the 2-3 minute ramp-up
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means very short spikes may complete before scaling activates.
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guidelines:
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- scenario: "Steady OLTP workload"
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base: "P75 utilization"
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auto_scale: "Enable, set max to P95 or 2x base"
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- scenario: "Highly variable workload (2x+ peak/baseline)"
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base: "P50 utilization"
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auto_scale: "Enable, set max to 3x base"
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- scenario: "Batch processing with known peak times"
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base: "Baseline requirement"
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auto_scale: "Enable, supplement with scheduled scaling if available"
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- scenario: "Dev/test"
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base: "1-2 OCPUs"
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auto_scale: "Disable to control costs"
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connection_impact:
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connections_per_ocpu: 300
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example: |
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Base 8 OCPUs → 2,400 connections
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Auto-scale to 16 OCPUs → 4,800 connections
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Connection limits scale with OCPUs automatically
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performance_during_scaling:
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notes:
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- "Active sessions are not interrupted during scale-up"
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- "New connections get additional capacity immediately"
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- "Scale-down uses connection draining — active sessions complete normally"
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- "Brief performance dip possible during scaling transition"
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gotchas:
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- "Short bursts (<3 min) may complete before auto-scaling activates"
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- "Very rapid burst from 0 to max can cause connection queuing"
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- "Auto-scaling cost can surprise if workload is consistently above base"
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- "Monitor auto-scaling events to right-size base OCPUs over time"
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