EBS Volume Rightsizing

Volumes oversized. The audit.

Overview

EBS volumes accumulate slack. A volume provisioned at 500 GB used 80 GB six months ago and uses 120 GB today; the team paid for 380 GB of nothing the whole time. Rightsizing is the discipline of catching that gap before the bill grows another 12 months.

• Volumes are oversized by default. Initial provisioning leaves headroom that compounds across years. The default is over-allocation.
• Per-volume utilisation. GB used versus GB allocated per volume. The gap is the savings opportunity.
• Quarterly audit. Walk the inventory each quarter. New volumes appear; old volumes drift; the catalog stays current.
• gp3 default plus per-volume cost. gp3 is cheaper than gp2 for the same IOPS; per-volume cost-versus-usage drives the rightsize decision.

The approach

Three habits keep the EBS bill matched to actual storage need: track utilisation continuously, default to gp3, and run a quarterly rightsizing pass.

• Per-volume utilisation tracking. Dashboard with GB used and GB allocated per volume. Sort by gap; act on the worst offenders.
• Quarterly audit. Walk the inventory. Mark drift candidates. Rightsizing eligible volumes follow the rightsize playbook.
• gp3 default. All new volumes ship as gp3 unless a specific reason requires gp2 or io2. Older gp2 volumes migrate over time.
• Per-volume cost analysis. Cost-versus-usage informs the rightsize decision. Documented policy keeps every team applying the same threshold.

Why this compounds

Each rightsized volume produces ongoing savings until the volume is destroyed. Compounded across hundreds of volumes per account, the savings move the storage line on the bill meaningfully.

• Cost efficiency. Right size matches actual use. The savings continue every month, not as a one-off.
• Operational hygiene. Quarterly audits keep the inventory clean and surface forgotten volumes that can be deleted entirely.
• Cost-aware culture. Engineers learn what storage actually costs. New provisions ship at the right size from the start.
• Year-one investment, year-two habit. The first audit takes effort. By year two the cadence runs itself and savings continue compounding.