Another look at ESXi iSCSI Multipathing (or a Lack Thereof)

I jumped on a call the other day to talk about iSCSI setup for a new FlashArray and the main reason for the discussion had to do with co-existence of a pre-existing array from another vendor. They were following my blog post on iSCSI setup and things didn’t quite match up.

To setup multi-pathing (the recommended way) for Software iSCSI is to configure more than one vmkernel port that each have exactly one active host adapter (physical NIC). You then add those vmkernel ports to the iSCSI software adapter and the iSCSI adapter will then use those specific NICs for I/O transmission and load-balance across those ports.

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PowerCLI Script to Create VMware Clusters on the FlashArray

The first step prior to provisioning storage on the FlashArray is to actually create the host records on the array itself. These records, in their most basic form, are just names of hosts with associated WWNs or IQNs. Pretty simple process in general, but as these VMware clusters get larger and larger (vSphere 6.0 now allows 64 hosts per cluster) scripting this configuration becomes a bit more appealing. Granted, this is a one-off operation, but still saves you from a tedious task. So I wrote one. This script also integrates setting the best practices on the ESXi hosts in the cluster and in the case of iSCSI adds the FlashArray iSCSI ports as a target on the host software iSCSI adapters.

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Configuring iSCSI CHAP in VMware with the FlashArray

I recently posted the process of configuring iSCSI on ESXi with the Pure Storage FlashArray. One of the things I left out is (optional) CHAP security configuration. It is a pretty straight forward process but worth writing down to save anyone who wants to configure it a few document cross-reference checks.

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