The 8GB is the vFlash which is part of the iDRAC. The host use a portion of that iDRAC for storing old Firmware releases when performing upgrades and on older generations you can store the servers config on with an scheduled task. With the rest of the 8GB you can create partitions and place bootable ISO on like LinuxRescue, ESXi Installer and so on.
IIRC the IDSDM can be distable in the Server Setup. We have tons of these because for over a decade we choose this kind of setup for our ESXi Hosts.... until vSphere 7.0.2 comes.
Origin3k
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Posted September 27th, 2024 21:16
https://www.dell.com/support/manuals/de-de/idrac8-with-lc-v2.05.05.05/idrac8_2.05.05.05_ug/enabling-sd-module-and-redundancy-in-bios?guid=guid-4bdf2961-a571-4279-9141-3b92b048e5da&lang=en-us