Sorry for missing this! I use Xtend SAN by ATTO [0], which has been around a long time but is still getting basic updates including native Apple Silicon support now, and seems to perform well. It uses a kext and I do worry the day may come that Apple kills support despite having nothing ready to go for equivalent functionality, but so far so good.

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0: https://www.atto.com/products/xtend-san-iscsi-initiator/