A fourth disk must be added to a raid 5 managed by the Perc h700 controller on Poweredge r910 server.
I want to do it by the Bios utility that can be activated with CTRL-R.
I ask if it is possible to do so without losing the data contained or I need to download OMSA and use this.
You'll need to download OMSA to achieve this. Once it is installed, you would perform a "Reconfigure" operation on the virtual disk under the "Storage" section.