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Re: Raid 1

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mick crane writes:

> On 2021-01-24 17:37, Andrei POPESCU wrote:

[...]

>> If you want to combine Linux RAID and ZFS on just two drives you could
>> partition the drives (e.g. two partitions on each drive), use the first
>> partition on each drive for Linux RAID, install Debian (others will have
>> to confirm whether the installer supports creating RAID from partitions)
>> and then use the other partitions for the ZFS pool.

I can confirm that this works. In fact, I always thought that to be the  
"best practice" for MDADM: To use individual partitions rather than whole  
devices. OTOH for ZFS, best practice seems to be to use entire devices. I am  
not an expert on this, though :)

>> You might want to experiment with this in a VM first. For testing
>> purposes you can also experiment with ZFS on files instead of real
>> devices / partitions (probably with Linux RAID as well).
>>
>> Kind regards,
>> Andrei
>
> This is my problem "where is the OS to be running the ZFS to put Debian on ?"

You could use a live system, for instance. Beware that this route is  
complicated. I linked to the guide in a previous mail but am not sure if you  
were finally able to check it (you mentioned at least one of my links not  
being accessible, but not which one...).

> All I want to do is back up PCs to another and have that have redundancy  
> with 2 disks so if one gets borked I can still use the other and put things  
> back together.
> How do I do that ?

My recommendation would be to keep it simple stupid: Let the installer setup  
RAID 1 MDADM for OS, swap and data and be done with it, avoid ZFS unless  
there is some reason to need it :)

For sure MDADM lacks the bit rot protection, but it is easier to setup  
especially for the OS and you can mitigate the bit rot (to some extent)  
by running periodic backup integrity checks which your software hopefully  
supports.

HTH
Linux-Fan

öö

[...]

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Thread

Raid 1 mick crane <mick.crane@gmail.com> - 2021-01-22 23:30 +0100
  Re: Raid 1 Linux-Fan <Ma_Sys.ma@web.de> - 2021-01-23 00:10 +0100
  Re: Raid 1 David Christensen <dpchrist@holgerdanske.com> - 2021-01-23 00:20 +0100
  Re: Raid 1 David Christensen <dpchrist@holgerdanske.com> - 2021-01-23 00:20 +0100
  Re: Raid 1 Andrei POPESCU <andreimpopescu@gmail.com> - 2021-01-23 13:30 +0100
    Re: Raid 1 Linux-Fan <Ma_Sys.ma@web.de> - 2021-01-23 18:20 +0100
      Re: Raid 1 Linux-Fan <Ma_Sys.ma@web.de> - 2021-01-23 19:00 +0100
        Re: Raid 1 Pankaj Jangid <pankaj@codeisgreat.org> - 2021-01-25 07:00 +0100
          Re: Raid 1 Andy Smith <andy@strugglers.net> - 2021-01-25 08:20 +0100
            Re: Raid 1 Linux-Fan <Ma_Sys.ma@web.de> - 2021-01-25 12:10 +0100
              Re: Raid 1 Pankaj Jangid <pankaj@codeisgreat.org> - 2021-01-25 13:50 +0100
    Re: Raid 1 David Christensen <dpchrist@holgerdanske.com> - 2021-01-23 23:10 +0100
      Re: Raid 1 Andrei POPESCU <andreimpopescu@gmail.com> - 2021-01-24 18:40 +0100
        Re: Raid 1 Linux-Fan <Ma_Sys.ma@web.de> - 2021-01-24 23:30 +0100
          Re: Raid 1 Andrei POPESCU <andreimpopescu@gmail.com> - 2021-01-25 07:40 +0100
      Re: Raid 1 Andy Smith <andy@strugglers.net> - 2021-01-24 19:00 +0100
        Re: Raid 1 Andrei POPESCU <andreimpopescu@gmail.com> - 2021-01-24 21:20 +0100
      Re: Raid 1 David Christensen <dpchrist@holgerdanske.com> - 2021-01-24 21:20 +0100
        Re: Raid 1 deloptes <deloptes@gmail.com> - 2021-01-25 09:50 +0100
        Re: Raid 1 David Christensen <dpchrist@holgerdanske.com> - 2021-01-25 19:00 +0100

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