#sysadmin

RAID storage-array maths as an API, computed locally and deterministically. The capacity endpoint computes the usable and raw capacity, the storage efficiency and the fault tolerance of a RAID level — RAID 0 stripes for n×disk with no redundancy, RAID 1 mirrors to one disk and tolerates n−1 failures, RAID 5 gives (n−1)×disk with one-disk tolerance, RAID 6 gives (n−2)×disk with two-disk tolerance, and RAID 10 gives (n/2)×disk — and reports the minimum disks each level needs. The compare endpoint lays the levels side by side for the same disks and disk size so you can weigh capacity against redundancy. The rebuild endpoint estimates how long it takes to rebuild a single disk at a given rebuild speed, the window during which a second failure would lose data in RAID 5/6. Everything is computed locally and deterministically, so it is instant and private. Ideal for storage, NAS, server and IT-admin app developers, capacity-planning and procurement tools, and homelab calculators. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is RAID array sizing; for data-transfer time use a transfer API.

api.oanor.com/raid-api

A Unix file-permission calculator as an API. Convert a symbolic permission string (rwxr-xr-x) to its octal mode (755) and back, and explain any mode in plain English with a per-class breakdown (owner / group / others, each read / write / execute). Full support for the special bits — setuid (4), setgid (2) and the sticky bit (1) — so 4755 ↔ rwsr-xr-x and 1777 ↔ rwxrwxrwt are handled correctly, including the capital S/T forms. Perfect for Dockerfiles and CI scripts, deployment and provisioning tooling, teaching, and any time you need to double-check a chmod value. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 4 endpoints. Distinct from anything that touches real files or networking.

api.oanor.com/chmod-api