I have grafana with influxDB monitoring my unRAID NAS which has:
a) 3 Array disks
b) 2 Cache disks
c) 3 Pool disks
d) 1 Backup disk
I’m trying to setup a panel to show disk “load” for each group (a, b, c and d) where load means the maximum io_time of any disk in that group, e.g. if 1 of the 3 disks in my “array” group is maxed out that should translate to 100% load for the array group.
In this version (which groups by disk serial) io_time is reported properly. You’ll see I have a query for each disk group but the graph and legend show one entry per disk instead of one per disk group (what I’m trying to get.)
In this version where I drop the “group by” and use max() to try to select the highest io_time within the disk group it shows the correct number of entries but reports erroneous results (note the missing ~95% load from 4:00-7:30)
Is there any way to accomplish what I want? I’m very new to grafana so sorry if I’m missing something obvious.
EDIT: Solved, see below