How can fix template to get correct writeKB/S for each disks

[bab]

I am using follow template :

https://github.com/grundic/zabbix-disk-performance/blob/master/Template%20Disk%20Performance.xml

to find out amount write KB/S on disks but for example my virtual machine has 1 disk (sda) and it contains volume such as follow :

/dev/mapper/vg00-root   /                       xfs     defaults        0 0
/dev/mapper/vg00-backup /backup                 xfs     defaults        0 0
UUID=154dc742-6137-43bc-acae-d9e3e198b93c /boot                   xfs     defaults        0 0
UUID=2554-72EE          /boot/efi               vfat    defaults,uid=0,gid=0,umask=077,shortname=winnt 0 2
/dev/mapper/vg00-home   /home                   xfs     defaults        0 0
/dev/mapper/vg00-lateral /lateral                xfs     defaults        0 0
/dev/mapper/vg00-tmp    /tmp                    xfs     defaults,noexec,nodev,nosuid        0 0
/dev/mapper/vg00-usr    /usr                    xfs     defaults        0 0
/dev/mapper/vg00-var    /var                    xfs     defaults        0 0
/dev/mapper/vg00-swap   none                    swap    defaults        0 0
tmpfs                   /dev/shm                tmpfs   defaults,noexec,nodev,nosuid        0 0
l

But after discovery on this host it find many items as writebyte/S ? Whta is the issue ? How can generate KB/S just for sda ?