EVA 8100/8400 IOPS

[Robert Galvan]

In a two year old post there are metrics for an EAV 8100 listed below. I'm looking at buying an eva8400 and I’m unable to grasp the numbers. The answer I’m looking for is IOPS and R&W/sec for VRAID1 or VRAID5 on an EVA8400.

The link states:
/”/
EVA
assuming a typical workload of 60% reads, 40% writes, 56 x 15K drives gives you:

6,412 IOPS, 280 MB/S writes in VRAID 1
4,080 IOPS, 448 MB/S writes in VRAID 5
560 MB/S read in both cases

http://h30499.www3.hp.com/t5/Storage-Area-Networks-SAN/EVA8100-array-capability-statistics/m-p/5210521#M58598

/”/

This leaves out the size of IOPS. So, fewer IOPS write more data can only be explained by the IOPS are host and the MB/S are on the array. Otherwise the IOPS for VRAID5 would have to be larger than for the VRAID1 which just doesn’t make a fair comparison.

If I have a 15K disk @ 115 IOPS/S * 160 = 18,400 IOPS/S, how much data can the host read and write/S using the 60% reads, 40% writes.

Does anyone have a HP decoder for the following.
EVA8400 with 160 15K disk
VRAID1 IOPS and data the host can write a/S ?
VRAID5 IOPS and data the host can write a/S ?
MB/S reads?

[Víctor Cespón · Accepted solution]

Hi Robert, those numbers are assuming 4K I/Os.

The sustainable I/O performace calculation is still the same, because it is limitted by the mechanical disks. On an EVA8400 you can use SSD disks, if you need some crazy number of IOPS.

Also, the EVA8400 benefits from having a larger cache than previous models.

In your scenario, 160 x 15K, 60% reads, you can have:

18.320 IOPS in RAID 1
11.658 IOPS in RAID 5
8.549 IOPS in RAID 6

Assuming an I/O size of 8K, that would be 67 - 143 MB/s

1600 MB/s in sequential read

[Mikko Niskanen_1]

Perhaps this docu might help:

"HP StorageWorks 8400 Enterprise Virtual Array (EVA8400) Performance paper "

http://h20195.www2.hp.com/V2/GetPDF.aspx/4AA2-9569ENW.pdf

[Robert Galvan]

Victor,
Thanks for the calculations. Do you have a decimal off somewhere?

Mikko
Thank you

[Víctor Cespón]

Oh, yes, that's due to the regional settings. Obviously the numbers are thousands of IOPS.