Calculate memroy usage

[nima0102]

Hi
I have to calculate memory usage by total_memory - free_memory.
I have create new item and set type to "calculate" and in Expression I set "last("vm.memory.size[total]") - last("vm.memory.size[free]") " . but apparently I have mistake on this item because status of item is "not-supported".
Thanks for any help.

[richlv]

which zabbix version ? do you have items vm.memory.size[total] and vm.memory.size[free] for that host, and are both of them returning data ?

[nima0102]

which zabbix version ? do you have items vm.memory.size[total] and vm.memory.size[free] for that host, and are both of them returning data ?

Thanks for your attention
The problem has been solved. because vm.memory.size[free] and vm.memory.size[total] were disable.after enable them problem solved.

Thanks again.