Ubuntu Debian expert for fixing missing HDD on dedicated Server

Job ID: 37537259

Budget: €30 – €250 EUR

Project explain:
- installed system: Ubuntu 20
- the server has 336TB HDD space
- no matter how i install the server, i get to 202TB
- so actually 134TB are missing what i need in / folder

need an expert who can fix me the problem, so that i have all the HDD space of 336TB available, like it sees its MegaRaid, so far i know, i need MegaCli install, there are some commands what i have received from my provider to make it working, but still i cant manage it (the commands i will forward to the freelancer who becomes the job)

if there is any expert in linux, storage, ubuntu, debian who can solve the task, very welcome