SNMP monitors the hard disk status of DELL IDRAC. The latest status of the fan status item often has no data. After restarting the zabbix-server service, there is again, but not after 5 minutes. After trying to downgrade the version to zabbix5.0, there is no such problem. The configuration of zabbix_server.conf is the same, zabbix5.0 uses the Template Server Dell iDRAC SNMP template, and zabbix5.4 uses the DELL PowerEdge R720 SNMP template.