Re: [PLUG] I need help with configuring Raid on Ubuntu server 20.04

[H Mottaleb via plug <plug@lists.phillylinux.org>]

Thank you Rich!

Before I go any further, here are the screenshots of the bios settings. I have configured raid 0.

> On Jan 13, 2021, at 9:59 AM, Rich Freeman via plug <plug@lists.phillylinux.org> wrote:
> 
> On Wed, Jan 13, 2021 at 9:48 AM H Mottaleb via plug
> <plug@lists.phillylinux.org> wrote:
>> 
>> I’m confused after reading the comments about advise against the use of the RAID in the BIOS in the event the motherboard fails.
>> 
>> What is the difference between the two and would I be able to configure the software raid without setting up the hardware or vice-versa? Should I not configure the raid settings in the bios and run the bash script as Rich stated?
>> 
> 
> So, based on your private email you're a little new to all of this,
> and so this might feel a bit like diving into the deep end.  There are
> advocates of both, but I suspect more in favor of software RAID here.
> When all is working fine there are no problems with either, and if
> anything hardware has some advantages IF you have battery backup, and
> it might even be a bit faster with a decent card.  The issue is that
> it is usually less flexible if you want to reconfigure things later,
> and if that card ever dies then your drives are useless unless you
> obtain a compatible card.  Software RAID is more flexible and the same
> drives are readable on any hardware (you could attach them all to a
> Raspberry Pi somehow and still read them).
> 
> If you wanted to use software RAID then you'd need to configure the
> hardware RAID card to just expose the drives to the OS directly.
> Ideally this is just as a raw drive pass-through (sometimes called IT
> mode), but some cards don't support this and you'd expose them as a
> bunch of single-drive volumes.  That approach might make the drives
> harder to read without the card, but would maintain the flexibility
> aspect.
> 
> If you want to use hardware RAID then you just configure it on the
> card and the OS just sees whatever drives you have the card configured
> to present as if they were physical drives.  At that point the OS part
> is the same as a non-OS install.
> 
> You mentioned starting over in email.  If you do that, I'd suggest
> getting a screenshot of your RAID config in hardware, and also get a
> screenshot of what the partitioning screen looks like.  Then once your
> OS is set up before you spend a lot of time messing around with your
> application just run df/lvs/pvs/vgs/blkid and just get a sense of what
> you're working with.  Then set up any mounts the way you want them
> before you go installing software so that everything doesn't end up on
> root if you don't want it there.  You probably could also configure
> Ubuntu to give you a really big root - that isn't a best practice but
> it would work.
> 
> -- 
> Rich
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