Hi Claiton,
The answers to your questions below:
1) 4 paths per node (or per iSER target because there is 1 iSER target per node for FlashSystems today), is not an iSER protocol limitation. FlashSystems implements this limit because we have seen that from performance perspective, a max of 4 paths per node is beneficial. Beyond 4 paths per node, the benefits of having multiple paths starts reducing incrementally.
2) If I understand it right (there are no switches shown in the diagrams), the first diagram shows 2 paths per node from each ESXi host and the second one is 4 paths per node from each ESXi host. Both are within the limits allowed by FlashSystems. In the first case, 4 paths to each vDisks should be visible on ESXi and in the second case there should be 8 paths per vDisk.
What is unclear to me is what you mean by VHBA. Those connections (in red and blue) seem to be like physical connections from the FlashSystems nodes to the RDMA/NIC ports on the ESXi box.
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Subhojit Roy
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Original Message:
Sent: Fri February 19, 2021 05:52 PM
From: Claiton Zanella
Subject: iSER Configuration
I sold a solution for a client that needed pass through a RQP process. It is a FS7200 with iSER RoCE connectivity for a VMware environment in DELL servers through a DELL Z9100.
It's a first for us and we are facing some issues in the implementation.
I would like do certify two things:
(1) This is a limitation of the iSER protocol or it's a Flashsystem Software implementation limit ?
(2) We have little experience with iSCSI/iSER implementations, so I would like to clarify which of this two drawings represents correctly those affirmations:
If you have experience with this type of implementatio, any tips would be very usefull.
Thanks in advance for your help!
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Claiton Zanella
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