ZFS存储池监控：Zfswatcher
Zfswatcher是ZFS存储池的监测和通知守护进程。定期检查zpool状态，当状态发生变化时发送可配置通知，如磁盘出现故障。它也控制磁盘存储设备LED。有一个内嵌的Web界面，用于显示状态和日志。
Features
- Periodically gets the zpool status and parses it.
- Sends configurable notifications on status changes.
- Supports the following notification destinations with configurable severity levels:
- local log file
- syslog (remote or local)
- e-mail to SMTP server
- Controls the disk enclosure LEDs (currently using external ledctl utility).
- Web interface for viewing status and displaying logs.
- Disk "locate" LEDs can be controlled through web interface.
- Stand-alone design. Suitable for storage appliances.
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