Prefail vs SMART Sniffer

Prefail monitors disk S.M.A.R.T. health across server fleets and sends warnings about problems and possible next steps. Its SENTINEL system weighs more than 25 S.M.A.R.T. attributes to assign each disk a risk score from 0 to 100, with history views showing seven-day changes and whether signals are stable or rising. Alerts include severity, an explanation, and a recommended action, and can be acknowledged, muted, or dismissed in batches. Supported RAID setups include MegaRAID 9260/9361/9460, Adaptec SmartRAID, and Linux mdadm, with visibility into disks behind controllers. Prefail offers Telegram alerts and a Telegram Mini App dashboard, with email as a fallback, plus a weekly PDF fleet report. Its Linux agent is a Bash script that runs smartctl and transmits S.M.A.R.T. output. Prefail says it sends data over TLS and stores it on a dedicated European server. The free tier covers up to two servers; paid plans start at $9/mo. The maker warns that S.M.A.R.T. monitoring cannot catch sudden failures and does not replace backups.

SMART Sniffer monitors disk health and sends warnings to Home Assistant. A lightweight Go agent runs on each monitored machine, where every drive appears as its own Home Assistant device. Its Attention Needed sensor covers ATA, SATA, NVMe, and SAS drives, returning NO, MAYBE, YES, or UNSUPPORTED. When a drive’s health changes, persistent Home Assistant notifications can appear automatically, with options to escalate, de-escalate, or dismiss them automatically. Agents advertise on the local network through mDNS/Zeroconf, allowing Home Assistant to find them without manual IP entry. Filesystem monitoring is optional; for configured mountpoints, it reports total, used, and available bytes plus usage percentage. An integration service call can provide SMART data and assessments for use with Google AI, ChatGPT, Claude, or Ollama. The agent also exposes HTTP endpoints for health, drive summaries, individual SMART data, and filesystem usage. SMART Sniffer is free and MIT-licensed. It requires smartmontools 7.0 or newer for JSON output; some USB enclosures that block SMART passthrough are reported as unsupported with unknown health.