“I built RAID, can I still lose data?” Yes. RAID covers disk failure only — not deletion, ransomware or fire. Safety is a three-layer structure. Three layers, three jobs RAID layer: survives hardware failure and a dropped disk, but rm still deletes; Snapshot layer: btrfs/ZFS snapshots defeat deletion and ransomware; 15-minute intervals shrink the loss […]
Past three devices, ssh everywhere becomes unmaintainable. Portainer’s Edge Agent mode pulls them into one control plane. Think in fleets, not boxes Edge Agent architecture: a light agent per device; the control plane tunnels config down, so no device ports are exposed; Reusable stacks: one compose definition pushed to many devices, parameterized per site; Permission […]
Treating OCR as “one model” is a common misconception. Results depend on the whole pipeline: detect, rectify, recognize, structure. OCR is a pipeline, not a model Text detection: DBNet-class models find text lines; skew-correct perspective first; Recognition: quantized CRNN/SVTR on the NPU runs 20-50 ms per line; Structuring: template-based field extraction (invoice no., date, amount) […]
The cardinal sin of boot optimization is guessing. First attribute time to phases with tools, then attack the longest. Measure before optimizing Measure: systemd-analyze blame for userspace services, kernel printk timestamps for the kernel phase, bootchart for the whole picture; Usual wins: disable unused services and drivers, defer non-critical units, parallelize dependency chains, and move […]
Legacy appliances are the biggest gap in home automation. A USB IR blaster is the cheapest bridge, and LIRC handles it on RK3588. IR is the last compatibility layer Start from a codes database: irdb covers most brands; use learning mode only for the leftovers; Aim matters: IR is line-of-sight — blaster placement beats software […]
Industrial failures are rarely about insufficient performance and usually about environmental fit. The order is environment, interfaces, supply, then performance. Environment first, parameters second Environmental fit: operating temperature, humidity, vibration, dust and EMI levels, plus whether conformal coating and fanless operation are required; Interfaces and protection: industrial sites demand isolated RS485/CAN, DI/DO and surge protection […]
Nextcloud’s default bundle runs on 8 GB devices, but small teams actually use file sync and sharing. Deploying lean makes the whole thing feel faster. Lean deployment is the point Compose only the core: nextcloud + mariadb + redis; leave Office, Talk and Collectives out unless used; Raise PHP memory_limit to 512M and enable OPcache […]
Vendor-proprietary protocols make integration expensive. OPC UA offers a common information model and a secure channel, the lingua franca of cross-system integration. Why OPC UA Information modeling: don’t expose bare variables — build a device/unit/station object tree so MES understands data semantics; Security: use certificate mode, not anonymous, and rotate X.509 certificates on a schedule […]
Paper tickets get lost or missed when order volume spikes, especially at peak. The kitchen’s core problem is information sync Solution: an Android screen per station showing pending orders with completion confirmation, rush highlighting and overdue reminders; Reliability design: orders cached locally so display survives network jitter and resyncs state on recovery; Results: ticket time […]
Server noise comes from fans and drives. RK3576’s low power makes fanless viable; what remains is disk noise. Silence is a systems problem Passive cooling: all-metal chassis plus thermal pads holds RK3576 under 75°C at full load in a normal room; Drive decoupling: rubber suspension mounts, no rigid contact with the chassis — kills most […]