Use this template to get IO data.
Installation:
wget https://raw.githubusercontent.com/grundic/zabbix-disk-performance/master/userparameter_diskstats.conf -O /etc/zabbix/zabbix_agentd.d/userparameter_diskstats.conf
wget https://raw.githubusercontent.com/grundic/zabbix-disk-performance/master/lld-disks.py-O /usr/local/bin/lld-disks.py
chmod +x /usr/local/bin/lld-disks.py
service zabbix-agent restart
Download template from zabbix-disk-performance/Template Disk Performance.xml at master · grundic/zabbix-disk-performance and import it to Zabbix server.