Mpps switch forwarding performance for iSCSI

clickmaster · Fri Nov 13, 2015 9:48 am

Hi there,

is there any recommendation for the right switch forwarding performance (Mpps) depending iSCSI?

We need two 24-port switches with 12 x 10GBit SFP+ and 4 uplinks with 10 GBit SFP+ each.
The switches will be used for Virtual SAN and Hyper-V iSCSI only.

The switches we have in mind have a forwarding performance of 480Mpps. Is that enough for a hyper-converged Virtual SAN environment?

Thanks in advance!

darklight · Fri Nov 13, 2015 4:50 pm

I assume it depends only on the amount of data you will be operating. The calculation is quite simple. If the overall writes/reads throughput will be within 480MBps limit you will be fine with it since starwind will be able to push this amount if data through synchronization channel.

clickmaster · Mon Nov 16, 2015 10:57 am

Thank you for the information so far.

My problem is that I don´t know if a iSCSI switch with 480 Mpps will bottleneck Virtual SAN.
Is 480 Mpps a good package throughput compared to a usual switch?

darklight · Mon Nov 16, 2015 3:42 pm

Well, Mpps is packets per second. With Jumbo Frames enabled your single packet size will be something near 9000 bytes. So I think you will have way much less than 480 million per module.

lohelle · Mon Nov 16, 2015 6:15 pm

If 9k packets (9000 BYTES), what sould be something like 150k packets/s on a 10gig-link.
64 byte packets would max out at 20Mpps for a single 10gig link.
These are single direction numbers, so double the numbers for full dupex.

Mon Nov 23, 2015 10:55 am

Lohelle, DarkLight - thank you very much for your contribution.

Anything else I can help here with?