Red Hat Certified Architect (RHCA) Certification Practice Exam 2025 – Your All-in-One Guide to Success!

The command that allows the kernel to re-read the partition table without requiring a system reboot is “partprobe /dev/sda”. This command instructs the kernel to dynamically retrieve the new partition table information from the specified device.

When you create or modify partitions on a disk, the kernel may not automatically recognize these changes until the system is rebooted. Using “partprobe” avoids downtime by making the kernel aware of the changes immediately, allowing for the new partition structure to be used without needing to restart the operating system.

Other commands listed serve different purposes. For instance, "mount -a" is used to mount all filesystems listed in /etc/fstab, which does not trigger a rescan of the partition table. "blkid" is for displaying block device attributes such as UUIDs and filesystem types, but it doesn’t alter the partition table or force the kernel to re-read it. "fdisk" is a disk partitioning tool that can modify partition tables but does not automatically communicate changes to the kernel on its own - it requires further prompts or commands, such as running "partprobe" after making changes. Thus, “partprobe /dev/sda” is the most appropriate choice for this specific function.