freebsd-questions Digest, Vol 760, Issue 6

Dave B g8kbvdave at
Fri Jan 4 15:43:11 UTC 2019

Remember to backup the RAID contents, if not already done and you
want/need to preserve the data, as I'll put money on it, that the
existing contents will be lost when you re-initialize the drives with a
different software RAID system (aka by ZFS) than is in use at this time
by the BIOS or other software..

Take care.

Have to ask, if, IF the BIOS is handling the existing RAID itself, why
can't FreeBSD handle the result just like a single drive?  Of course, if
some tool/driver loaded at boot time by the old OS is doing it, then
it's toast in any case.

It's worth checking if it's a plug in disc controller that is doing the
RAID functionality, if so, then "It's own BIOS" will be handling it, and
FreeBSD should just see the one logical drive.

That's what happened with Nas4Free (FreeBSD based) when we put on an old
HP server at work a few years ago.  The original content data was still
lost though.  (Not an issue that time!)


Dave B.

On 04/01/2019 12:00, freebsd-questions-request at wrote:
> On 03/01/2019 11:05, Carmel NY wrote:
>> That doesn't answer my question. I wanted to know if when I first
>> install FreeBSD 12, and choose ZFS as the file system, will it
>> recognize the three drives and set them up by default as a RAIDZ (RAID5
>> or do I have to do that manually after FreeBSD is installed?
> You will need to go into your server BIOS and delete the existing RAID
> configuration.  The installer will then see all three drives, and you
> can tell it to create a RAIDZ over all three of them.
>     Cheers,
>     Matthew

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