Service Time and what it means

[fterveen]

I am managing 4 3par systems
2 F400 replicating data to each other synchronously
2 F200 arrays in 2 seperate locations

I am checking their service time of VVluns and I see that the read and write st is fairly ok
But the TOTAL st = read st / write st
I thought that it would be
Total st = read st + write st ?

Please help me in understanding this a little better

Thanks in advance

Frank

[ilv]

From my observation it is a weighted average (didn't get any doc on this):
Total_st=(ReadIOPS*Read_st + WriteIOPS*Write_st) / (ReadIOPS+WriteIOPS)

And it should mean : the time spent for servicing a request during the last second.

Just to add Read_st and Write_st , it seems to me useless ...