EVAPERF and %WriteReq and %ReadReq

[Mr. Magic]

Hello All,

Does anyone know what those 2 results mean for VDG?

[Víctor Cespón]

Read requests per second and write requests per second.

[Mr. Magic]

There are followinf fields:
WriteReq - I thought those were WriteReq/s
ReadHitReq
ReadMissReq
%WriteReq - This value is measured in %s so I was interested what that is.

[shIVinator.]

I looked at my system and I don't see those fields (I am using 9.0). I would think that those values would give you the %read and the %write. If you add them up does it equal 100?

Which version are you running?

Regards,
Duane

[Amar_Joshi · Accepted solution]

I believe you are looking under TLVIZ-VDG file. %WriteReq and %ReadReq are percent of IOPS received within that particular diskgroup at that time. Add of these 2 column should come to 100 (sometimes 99.9) This parameters are good to understand the Read/Write ratio which will give you idea about whether the application is read intensive or write intensive.

[Mr. Magic]

Great, thank you for the answer. You are correct that those numbers were in TLVIZ. And that helps me a lot.

[Mr. Magic]

I did monitor this for a while and results do not make much sense.
I get sometimes 1000% or more in %WriteReq which completly throws this idea away.