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Small, honest calculators for the math that comes up daily. All run in your browser — nothing is sent anywhere.

NetApp disk shelves and controller used for capacity planning — **Capacity starts with shelves and controllers**Robert · CC BY 2.0 · Wikimedia Commons

Aggregate sizing calculator

Raw disks → RAID geometry (RAID-DP/TEC/4/0) → WAFL overhead → snapshot reserve → volume efficiency. Plan capacity before you buy shelves.

IOPS / throughput converter

Convert MB/s ↔ IOPS, estimate outstanding I/O and SnapMirror catch-up throughput, then test payload rates against network link headroom.

SnapMirror bandwidth / catch-up estimator

Model baseline and incremental transfer time, outage recovery, shared-link saturation, and the bandwidth needed for a two-hour replication window.

Snapshot retention planner

Turn backup frequency, retention tiers, volume size, and change rate into a Snapshot count, reserve estimate, footprint cost, and ONTAP policy commands.

ONTAP command decoder

Paste any ONTAP CLI command and get every flag explained — volume create, snapmirror, export-policy rules, LUNs, QoS and more.

NCDA practice exam

Take a 60-question, 90-minute browser-based exam with review flags, explanations, and scoring across five ONTAP topic buckets.

Honesty note These calculators model typical ONTAP behavior — they are planning aids, not NetApp's official sizing tools. Real results depend on workload, platform, and configuration. Always validate with Active IQ / NetApp professional services for procurement decisions.