One of the few hard requirements we make to configure best practices on ESXi for the FlashArray is to create a SATP rule. A SATP rule simply describes a certain configuration (mainly around multipathing) for a specific set of devices (usually devices from an array). For the FlashArray, this rule consists of making sure devices are using Round Robin and an I/O operations limit of 1.
esxcli storage nmp satp rule add -s VMW_SATP_ALUA -V PURE -M FlashArray -P “VMW_PSP_RR” -O iops=1 -e “FlashArray SATP Rule”