Monitor Hitachi NAS (HNAS) systems via the NAS File Storage REST API (v8, TCP port 8444) using a special agent — no SNMP required.

Monitored components:

• Filesystems — space usage with configurable levels (default 80%/90%), thin provisioning state (enabled/valid, states configurable), mount status (unmounted filesystems are reported as WARN by default), read-only flag, snapshot space usage
• Snapshots — per filesystem: number of snapshots, age of the oldest snapshot (detect forgotten snapshots consuming space) and time since the last snapshot (detect that snapshot creation has stopped working)
• Storage pools (spans) — space usage with configurable levels, health state (CRIT if the pool reports unhealthy)
• Virtual servers (EVS) — status mapping ONLINE/DISABLED/OFFLINE/NOT_CONFIGURED
• Cluster nodes — node status, model, firmware version and uptime
• System drives (LUNs) — drive status, degraded and access state

Features:

• Authentication via API key (X-Api-Key, recommended by Hitachi) or username/password — stored as Checkmk secrets
• Full WATO configuration: special agent rule plus check parameter rulesets for filesystems, snapshots and storage pools
• Metrics, graphs and perfometers for filesystem and storage pool usage, snapshot count and snapshot age
• Service descriptions included for all checks

Setup: Create an API key on the HNAS (apikey-create), then configure the rule Hitachi HNAS via REST API under Setup > Agents > Other integrations.

Requires Checkmk 2.4.0 or later. Developed and tested against NAS File Storage REST API v8.