How to calculate total_OPS?

[malo1230]

Query:

index=xxx source=Perfmon:LogicalDisk host=$h$ ( counter="Disk Reads/sec" OR counter="Disk Writes/sec" )
| eval read_ops=IF(counter="Disk Reads/sec",Value,0)
| eval write_ops=IF(counter="Disk Writes/sec",Value,0)
| eval tot_ops=write_ops+read_ops
| fields read_ops write_ops tot_ops 
| timechart max(read_ops) max(write_ops) max(tot_ops)

Need to sum the read_ops and write_ops into field total ops for each time interval (1 min) for a timechart.

Because the writes ops and read ops values are in separate rows per time interval. example below:

2/16/22 5:29:59.000 PM	02/16/2022 17:29:59.224 -0500 collection=LogicalDisk object=LogicalDisk counter="Disk Writes/sec" instance=_Total Value=27.222955244825506 Collapse
2/16/22 5:29:59.000 PM	02/16/2022 17:29:59.224 -0500 collection=LogicalDisk object=LogicalDisk counter="Disk Reads/sec" instance=_Total Value=5.316598854323969 Collapse

[SanjayReddy]

@malo1230 
can you use span=1m

in timechart command 

| timechart span=1m read_ops write_ops tot_ops