Reboot SAN Controllers
To reboot Dell SAN Controllers use the following option: Summary tab / Actions / System / Shutdown-Restart and select Restart in Sequence. This will restart one controller then restart the next after the first has come back online.
SAN Configuration Best Practice
Guide for configuring Dell SAN: https://downloads.dell.com/manuals/common/sc-series-vmware-vsphere-best-practices_en-us.pdf