I too have many decades of IT experience. (over 36 years) Since I know you have experience at least in the concepts... No matter what OS that might be, let's talk like adults.
Your first question, how do you migrate from one RAID type, Volume Manager, or filesystem to another? ...You probably know this already:
- Backup.
- Setup the framework of what you want to end up on.
- Restore within that framework.
In Linux, you have many, many, many ways to do that.
Yes. I do consider LSI RAID Controllers as being the industry standard for hard raid controllers... Now let's talk a bit more before going into the details of that.
Why the choice of going from mdadm to hardware RAID? Because to me, that, at least for me, and my experience, is a step backwards. Is this for your machine or commercial production machine?
My own decisions for going from hard-RAID to mdadm, was because with Hard RAID, you are locked into that config, below the OS level. To recover, you are locked into correcting things at the RAID Controller BIOS level first.
My disaster recovery strategies have evolved greatly in the past 36 years. Especially if your mission is uptime, and to be online, and where your priorities lie on getting back up in a timely manner.
RAID (of any type) is not a replacement for good backups.
I could talk volumes here... I used to teach CS, and i was an IT Consultant. I'm sure that would bore you. So to pair that down to "you", and what you "need", let's hear about your server, and it's job.
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