I have a DL180 G6 HP P410i with 2x SATA in RAID1 running Linux CentOS.
Can I add (using the hot swappable drives) two more hard drives into the server and mount them without rebooting the server?
Yes. You'll want to use
It depends upon what you intend to do upon inserting the disks.
You can plug them in, but they will need to be configured as a logical drive in order to be usable to the operating system.
If you want to expand the existing logical drive, the dynamic changes, and you may need to have a battery-backed cache unit enabled on your controller.
If running CentOS, you'll want to install the HP Management Agents or at the very least, the hpacucli utility.
Shows the running configuration.
Based on the output, you'll want to create a new logical drive of RAID 1 using the unassigned disks... Something like:
Where slot is the controller's PCIe slot number from the first command, and the drives are the disk port numbers from the first command.
Once you make this change and exit the utility, a new block device will be available at the OS level.
Are you sure that you have a P410i? The DL180 GP does not have a P410i option.
Either way, yes, the controllers that come as standard equipment on a DL180 G6 do support hot-add. If you have the HP ACU CLI installed, you can create the logical drive from within your OS. Then rescan using your OS tools and mount.