Hi,

Thanks for your question.

You are correct that the IO module speed is what matters for hosts and storage.

 

 

Let us know if you have any additional questions.

Ya i was under impression that cluster network is just for managing the cluster but it has nothing to do IO outputs between hosts and storage

Then i went to datacenter  and got this. Here it clearly says that it is 25 GBps but for some reason other guy claims that this doesnt matter but cluster network speed matters. This was so confusing to me. Cluster network doesnt carry IO traffic but these modules do

So this module can be 25 GBps it is just wrong SFP used this is why PowerStore shows 10 GBps

Hi Josh 

Also I found this diagram

As far as I understand this diagram ports are dedicated for iSCSI traffic  NVME traffic they cannot be mix and match for example for iSCSI

My understanding is that if we implement iSCSi then we use port 2 on module and if we are going with NVME TCP/IP then we have to use port 0 on each controller.

Not also clear about LACP bonding can ports for NVME be bonded to form LACP for example from IO module 1 and 2

Example NVME TCP network port 0 on node 1 to be bonded with bonded with port 0 on node 2

You should be able to bond nvme/tcp with port 3.

https://dell.to/3NrSzAq

I can see that according to this diagram Port 3 is reserved for NAS network> we will be only using block storage no NAS

According to diagram port 0 is used for NVME and it doesnt say can be bonded ALso it says it is dedicated port for NVME TCP

So i can bond Port 0 with port 3 on each node for NVME TCP

https://www.dell.com/support/manuals/en-us/powerstore-5200t/pwrstrt-ntwkg/cable-the-nvmetcp-network?guid=guid-41803c07-302d-43d6-9793-5bdcf5767f16&lang=en-us

This document also specifies which port to use for NVME TCP/IP didnt see anything on NVME TCP port bonding

https://dell.to/48cyyFI

“Direct attached iSCSI or NVMe TCP hosts are supported on other ports, but not for ports 0 and 1 (bond0) on the 4-port card.”

Should be fine on port 3 if no NAS is being used.

Also can do it at OS level.

https://dell.to/3uS8S2M

based on what you said then we dont even need IO modules.4 port cards port 0 and 1 are connected. I was under impression that these ports are used just for Cluster networking but have no bearing in carrying traffic from host.

IN every other storage manufacturer cluster network is one thing and IO input output from hosts to actual disk is carried over IO modules. Cluster network is just management network but apparently it also carries traffic from hosts to disks which is first time I hear about after almost 10 years working with storage 

Direct attached iSCSI or NVMe TCP hosts are supported on other ports, but not for ports 0 and 1 (bond0) on the 4-port card.

from hosts to actual disk is carried over IO modules

Then over here I have 4 ports IO module which is for some reason 10GBps

These ones should carry traffic and Ports 0 and 1 on 4 port card should be only for Cluster network but apparently that is not the case

THe reason this is confusing is that I have extremely bad performance on NVME TCP IP hosts and based on internet articles NVME is supposed to outperform iSCSI however in my case NVME is extremely slow and basically it comes to the point that NVME cannot be used otherwise performance is way worse than iSCSI so I would basically go with iSCSi where I get decent performance.

Based on this I dont even need IO module but what I got from this document networks mapped for 4 port card are just for management and high availability but not IO traffic cause right now IO modules are configured for 10GBps

Apparently it is high misunderstanding on part but I cannot get any decent performance out of NVME TCP