RAID Calculator vs WLAN Pros Toolbox

How much space will you actually get? RAID Calculator answers in seconds, for identical drives in classic RAID and for the mixed drives in a real NAS, whether it runs Synology, Unraid, ZFS, SnapRAID or Btrfs. PLAN YOUR NEXT DRIVE Real NAS boxes rarely hold identical drives. Give each bay its own size, or leave it empty, and see what your system does with them: • Five systems: Synology SHR, SHR-2 and RAID 1, 5 or 6; Unraid; ZFS RAID-Z; SnapRAID; and Btrfs RAID1 • Every drive drawn to scale and split into what it holds: data, parity, a mirror copy, or nothing at all • Unused capacity hatched, with the number spelled out • Biggest Upgrade names the single purchase that unlocks the most space, with one tap to try it • Save your current setup, then see every change compared with it (“+4 TB usable”), and Revert when you’re done • Unraid and SnapRAID put parity on your largest drives automatically • For ZFS, the figure ZFS itself will report, labeled as an estimate • Advice where it matters: SnapRAID’s recommended parity count, and a note on very wide RAID-Z groups • From 2 to 12 bays for Synology, or up to 30 for Unraid, ZFS, SnapRAID and Btrfs RAID1 COMPARE SYSTEMS See your drives under every system at once, most usable space first, with failures tolerated and unused space for each. Tap a system to switch to it and watch the same bays re-split. CLASSIC RAID, INSTANTLY Pick RAID 0, 1, 5, 6, 10, 50 or 60, JBOD, or ZFS RAID-Z1, Z2 or Z3, set from 1 to 24 drives and their size, and the answer is the first thing you see: • Usable capacity, raw capacity and storage efficiency • A drive strip showing which drives hold data, parity or mirror copies, split into groups for nested levels and RAID-Z • How many drives can fail, honest about the cases that depend on which drives fail • The TiB figure most NAS systems will report, and for RAID-Z what ZFS itself will report • A rebuild-risk caution for single-parity layouts on large drives, with a one-tap switch to a safer level when your drives allow it • Invalid setups explain themselves and offer a one-tap fix • Relative speed and availability ratings for every level LEARN AS YOU GO Every RAID level and every NAS system has an info sheet: an overview, pros and cons, and typical uses, plus ratings for RAID levels. RAID-Z and every NAS system also explain how the app calculates them. ON EVERY SCREEN • On iPad, and on iPhone Duo opened in landscape, results sit beside inputs and systems line up side by side • On iPad, up to 30 bays fit on screen • On iPhone Duo, info opens in place of the inputs so the results stay in view • Rotates to landscape on iPhone • Built for iOS 26 with native controls and Liquid Glass • Dark mode, Dynamic Type at every size, and full VoiceOver support that also reads each drive within a group • English, Spanish, French, Italian, Japanese, German, Traditional and Simplified Chinese, Korean, Brazilian Portuguese and Russian PRIVATE BY DESIGN No account, no ads, no tracking, no network connection needed. Every calculation happens on your device. Capacities use standard simplified formulas and don’t account for filesystem overhead, apart from the labeled ZFS estimate. Speed and availability ratings compare RAID levels with each other; they aren’t benchmarks. Not affiliated with or endorsed by Synology Inc. Synology and SHR are trademarks of Synology Inc. Not affiliated with or endorsed by Lime Technology, Inc. Unraid is a trademark of Lime Technology, Inc. ZFS is a trademark of Oracle and/or its affiliates. Not affiliated with or endorsed by Oracle.

WLAN Pros Toolbox gives Wi-Fi pros, IT help desks, instructors and students 260+ network tools, plus a Wireless Classroom of lessons and simulators. Free. No account. No ads. No data collected. Built by Keith Parsons, CWNE #3, and Wireless LAN Professionals. Everything is grouped so you find the tool you need fast: live network tests, calculators, reference tables and the Wireless Classroom. The Wireless Classroom - 30 Guided Lessons in plain language, where the pictures do most of the teaching: Find My, Starlink, Wi-Fi Calling, Travel Routers, Captive Portals, Mesh and Extenders, One Talker per Channel, Is Your Router Too Old?, and more. - 50 interactive simulators: Wi-Fi Through a Wall, Multipath, Rate vs Range, Modulation, Polarization, OFDMA vs MU-MIMO, MIMO and Beamforming, Airtime Fairness, Multi-Link Operation (Wi-Fi 7), Roaming Walk, DFS and Radar, 802.1X and EAP. - Presenter mode for the projector, one step at a time. - A Teacher's Guide and a Field Manual for instructors. Is It Your Wi-Fi or Your Internet? Test My Connection helps answer the question everyone asks, in plain language. Start here when someone hands you a slow connection. Networking Tools Ping, traceroute, DNS, WHOIS, BGP/ASN, MAC vendor lookup, IP geolocation, port scan, HTTP and SSL/TLS inspectors, NTP, Wake-on-LAN. Calculators Free space path loss, Fresnel zone, link budget, EIRP, dBm and watts, rain fade, noise floor, antenna downtilt, capacity planner, SSID airtime, throughput, PoE budget, IP subnets, GPS. Quick Reference 103 tables in 13 topics: channels, 802.11 standards, MCS index, security and authentication, reason codes, cabling and connectors, ports, and a Wireless Glossary of 123 plain-language terms in English, Spanish, French, Italian and German. Reference tables and calculators work offline. Live tests need a network connection. iOS limits what apps can read about Wi-Fi, so on iPhone and iPad some live Wi-Fi details come from an optional companion Apple Shortcut. Free for the community. Also on Android, Windows, Mac, the web and WLAN Pi: toolbox.wlanpros.com