Rescan a SCSI bus without rebooting
After adding a hotplug-capable HDD to Linux, whether on a VM or physical machine, # fdisk -l may not show it until reboot. Rescanning SCSI can detect it without rebooting.
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How to rescan the SCSI bus to add or remove a SCSI device without reboot
Linux supports online SCSI rescans, allowing drives to be rescanned without restarting the system.