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

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

I re-configured to Raid 5+1 hot spare.

Below are the screenshots:

> On Jan 13, 2021, at 12:38 PM, Rich Freeman <r-plug@thefreemanclan.net> wrote:
> 
> On Wed, Jan 13, 2021 at 12:21 PM H Mottaleb <h_mottaleb@yahoo.com> wrote:
>>  Here you go....I setup Raid 0 in the bios as I couldn’t find the IT mode.
> 
> You definitely don't want to do that.  If you want to use hardware
> RAID then set up something safe like RAID5/6.  If you want to use
> software raid then each of those drives ends up needing to be a
> separate RAID, so you might want 6 different RAID0 "arrays" of one
> disk each.
> 
> IT mode might require reflashing the card, and not all cards even support it.
> 
>> The screen-shots of the bios settings and the df/lvs/pvs/vgs/blkid output.
> 
> Your screenshots are really low-res which makes them hard to read.
> But I can make out enough to tell what is going on.
> 
> You're going to want to redo that RAID, which might require a
> reinstall.  However, for reference, Ubuntu is seeing all 6TB of space,
> and it is creating the partitions that you see in df.
> 
> From the install screenshot you can see on the bottom line that it is
> setting up one more giant 5TB unformatted logical volume.  So all you
> need to do is format and mount it somewhere.
> 
> I could give you exact command line instructions to do that, but I
> can't actually read the text well enough to ensure that I'm giving you
> the right device names (and I'm not familiar with what ubuntu default
> lv names are).
> 
> You might not actually want all 5TB in one giant logical volume.  If
> so it is easy to delete and re-create a smaller volume and still have
> space free for future use.  You can also resize volumes later if their
> filesystems support it (like ext4 does), but that is more of a pain,
> at least for shrinking.
> 
> For now I suggest reconfiguring as RAID5/6 if you want to use hardware
> RAID.  If you want to use software RAID I'll defer to somebody who
> knows what the best way to set this up on Ubuntu is so that it isn't
> tripping over itself.  It is easy enough to do from the command line
> but if you don't do it the "Ubuntu way" you might end up fighting the
> thing every time you install a new kernel or whatever.
> 
> After you get your RAID set up send some higher-res photos of the
> lvs/vgs/df output and we'll get your mounts set up.\
> 
> -- 
> Rich

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