Sum same items for all servers in all group (aggregate)

[nima0102]

Hi
I need to sum same items for all servers in all group.After some search on net I found "Aggregate" type for my purpose.Before any try on this, I want to know that can I aggregate on same item in some group NOT one group?
I explain my plan:
We intend to create item(named "X") in order to sum one interface bandwidth(named "A" item) on all servers in different groups! all "A" items are fetched every minute.But for new aggregate item ("X") we want average of items in 5 minute and then sum them.
One unclear case for me is, if one of "A" items is not correctly fetched,How is aggregate item calculated?

Thanks for any help or guidance

[nima0102]

Hi again.
I have upgraded to 1.8.3.because 1.8.2 is not support aggregate item for several groups.
But I do not know how can define several groups in aggregate item.
Thanks for nay help or guidance

[nima0102]

Hi
Is there any suggestion ?

Thanks in advance