Lvm can be combined with mdraid but they are different animals if related.

My easiest success was using Lvm and mdraid with a single drive for the os
in General.

I am currently planning a new home server and will be using mdraid along
with lvmcache.

On Sat, Jul 18, 2020, 8:05 AM Snyder, Alexander J via PLUG-discuss <
plug-discuss@lists.phxlinux.org> wrote:

> You are correct, for a hardware RAID you need a hardware RAID controller.
>
> I've only used LVM to join multiple disks, but I'm not sure if that's
> classified as "Software RAID".
>
> I have a Hardware RAID controller with 12 SAS drives.  From there, I slice
> the large "disk" up with LVM.
>
> Thanks,
> Alexander
>
> Sent from my Galaxy S10+
>
> On Sat, Jul 18, 2020, 07:58 Michael via PLUG-discuss <
> plug-discuss@lists.phxlinux.org> wrote:
>
>> I think I want to start a raid array level 5.
>> this is what my google search revealed to me:
>>
>> If you want to use hardware RAID device, use hot swappable hardware
>> RAID device with spare disks. If any disk fails, data will be
>> reconstructed on the first available spare disk without any downtime
>> and since it is a hot swappable device, you can replace failed device
>> while server is still running.
>>
>> Unfortunately, I am finding it difficult to find how to do a hardware
>> array. Everything I'm finding has to do with software array with a
>> paragraph about hw array so when I google hardware 'array linux' I get
>> results and I get confused. Could someone point me to some concise
>> instructions on doing this? I found one promising one on wiki
>> (https://raid.wiki.kernel.org/index.php/Hardware_Raid_Setup_using_MegaCli
>> )
>> but they wanted a raid controller to be installed on your system
>> first....
>> Ohhhh .... I think I get it! the hardware raid requires The controller
>> which is a pci card. So now I need a software array
>>
>> is that correct?
>> Any concise instructions?
>> --
>> :-)~MIKE~(-:
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