3PAR StoreServ Storage
cancel
Showing results for 
Search instead for 
Did you mean: 

why backend iops increased by 5000 IOPS Although the frontend IOPS = 100?

Highlighted
RamyShaker
Occasional Contributor

why backend iops increased by 5000 IOPS Although the frontend IOPS = 100?

Hello ,

 

I do test as below

Copy a 200GB file with IO Size 1MB/sec

But using 3par charts Virtual volume IO Size 512KB/sec

IOPS on the virtual volume = 100 IOPS

but the backend iops on the physical Disks increased by 5000 IOPS

Note CPG is Raid 5 (3+1) , Step size 256KB .

My question why backend iops increased by 5000 IOPS Although the frontend IOPS = 100?

 

Thanks

Ramy Shaker

1 REPLY
Cali
Honored Contributor

Re: why backend iops increased by 5000 IOPS Although the frontend IOPS = 100?

I know this, but no details:

"Do not look at IOPS when doing sequential workloads, as the system will aggregate multiple IOs when going to the back-end. Use KiB/s instead."

At Random R5 1 IO generate 4 IOs at Backend.

That was not planned in this way.