Supermicro also sells a sata plug mounted storage device it would have enough for a kernel to be loaded.
though i think a PXE or similar boot option would be a smarter move. just enough to bootstrap something to run in ram. (alternatively a minimal kernel and dedicate a section of the disks in the chassis to holding the running software (500MB x 45 with decent levels of erasure coding is a fairly minimal slice.) the kernel could then pull down the code after first boot (or updates)
though i think a PXE or similar boot option would be a smarter move. just enough to bootstrap something to run in ram. (alternatively a minimal kernel and dedicate a section of the disks in the chassis to holding the running software (500MB x 45 with decent levels of erasure coding is a fairly minimal slice.) the kernel could then pull down the code after first boot (or updates)