Okay, so just how do we wire up that cluster?
We connect two SAS cables from each HBA on each node to one expander on the JBOD.
We then connect two SAS cables from each HBA on each node to one expander on the JBOD. Note the left/right split between the cable sets to keep things simple and clean.
This gives us two redundant paths between the Hyper-V hosts if setting up an asymmetric cluster (2 nodes 1 JBOD) or redundant paths between SOFS nodes and the JBOD.
The following shows the setup for an Intel Server System R1208JP4OC 1U single socket server:
We always try to keep the cables plugged in identically on each node. So, in this case the bottom HBA is plugged into Expander 0 and the top HBA is plugged into Expander 1.
In a Scale-Out File Server cluster where we have three nodes and three JBODs we would be utilizing an LSI SAS HBA with 4 external ports (-16e). In that case we would cable up each node just as we did here between each JBOD giving us the left/right split.
Given the Intel JBOD2224S2DP’s three external ports per expander we would be limited to the three node setup unless we utilized our LSI SAS6160 SAS Switches to scale beyond three nodes and JBODs.
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