Synology Check Reference

All parameters, thresholds, and configuration options for the Synology NAS check in octoja.

Written By Erdinc Akay

Last updated About 2 months ago

The Synology Check monitors Synology NAS devices via SNMP and collects disk health, RAID status, volume usage, temperature, and I/O load.

Configuration fields

FieldTypeRequiredDefaultDescription
HostStringYes—NAS hostname or IP address
SNMP versionSelect (v2c / v3)Yesv2cSNMP protocol version used to query the device
SNMP CommunityStringNopublicSNMP v2c community string (shown when version is v2c)
SNMPv3 userStringNo—USM user name (shown when version is v3)
Authentication protocolSelect (None / SHA-1 / SHA-256)NoNoneMessage authentication algorithm (v3 only)
Authentication passwordPasswordNo—Shown when an authentication protocol is selected
Privacy protocolSelect (None / AES-128 / AES-192 / AES-256)NoNonePayload encryption algorithm; requires authentication (v3 only)
Privacy passwordPasswordNo—Shown when a privacy protocol is selected
System Temp Warning (°C)Number (°C)No50System temperature that triggers a warning
System Temp Critical (°C)Number (°C)No60System temperature that triggers a critical result
Disk Temp Warning (°C)Number (°C)No45Disk temperature that triggers a warning
Disk Temp Critical (°C)Number (°C)No55Disk temperature that triggers a critical result
Volume Usage Warning (%)Number (%)No80Volume usage that triggers a warning
Volume Usage Critical (%)Number (%)No90Volume usage that triggers a critical result
I/O Load Warning (%)Number (%)No80Storage I/O load warning threshold in percent
I/O Load Critical (%)Number (%)No95Storage I/O load critical threshold in percent

Collected metrics

  • Device info: model name, DSM version, serial number
  • System component status: System, Power, System Fan, CPU Fan (OK when reported as Normal)
  • CPU utilization (%) and memory utilization (%)
  • System temperature (°C)
  • Per disk: name, model, type, temperature, status, health status, remaining life (%), bad sectors
  • RAID volumes: name, status, total / free size, used (%), hotspare count
  • Storage I/O per device: instantaneous load (%), 5-minute and 15-minute load averages
  • Per-check issues: list of detected problems with severity, code, subject, value, threshold, and detail

Platform support

PlatformSupported
WindowsYes (network-based)
LinuxYes (network-based)
macOSYes (network-based)

Notes

  • Requires SNMP enabled on the Synology NAS (Control Panel → Terminal & SNMP). The check supports both SNMP v2c (community string) and SNMP v3 (user-based security); select the version your NAS is configured for.
  • Uses Synology SNMP MIBs. Works with Synology models that expose the standard Synology SNMP MIB (DS, RS, SA series).
  • The check runs every 5 minutes by default.

See also: Configure a Synology Check