CentOS - Jan 2017 - CentOS 7 install on one RAID 1 [SOLVED]

Gordon Messmer wrote:
> On 01/24/2017 08:33 AM, m.roth at 5-cent.us wrote:
>>     I'm building a new box, and I want three partitions - /boot, /,
and
>> swap, on*one*  RAID 1, not three separate partitions. Other than
>> <alt-f2> mdadm...,*is*  there any way in the graphical installer
to do
>> this? All I see is a way to make three separate partitions.
>
If that wasn't clear, I meant to make the two drives into a single RAID 1,
*then* partition that for root, swap, and boot.
>
> I don't know the answer to that question, but what I can tell you is
> that I handle software RAID setup in kickstart, creating the partitions
> manually, so that I can replace drives using a shell script.  Making the
<snip>
Trouble is, it's for this one box. Next box, or the one after, will be
happy with the kickstart as it is.

The solved part: I did the <alt-F2> and created the RAID 1. I went back to
the GUI, and tried to rescan... it didn't find it, didn't show any
drives,
then it showed the two real drives... then it gagged, and crashed, and
rebooted. HOWEVER, when I tried the next time, anaconda's probing found
the RAID, and I'm installing now.

*phew*

         mark

On Tue, January 24, 2017 1:10 pm, m.roth at 5-cent.us
wrote:
> Gordon Messmer wrote:
>> On 01/24/2017 08:33 AM, m.roth at 5-cent.us wrote:
>>>     I'm building a new box, and I want three partitions -
/boot, /, and
>>> swap, on*one*  RAID 1, not three separate partitions. Other than
>>> <alt-f2> mdadm...,*is*  there any way in the graphical
installer to do
>>> this? All I see is a way to make three separate partitions.
>>
> If that wasn't clear, I meant to make the two drives into a single RAID
1,
> *then* partition that for root, swap, and boot.
>>
>> I don't know the answer to that question, but what I can tell you
is
>> that I handle software RAID setup in kickstart, creating the partitions
>> manually, so that I can replace drives using a shell script.  Making
the
> <snip>
> Trouble is, it's for this one box. Next box, or the one after, will be
> happy with the kickstart as it is.
>
> The solved part: I did the <alt-F2> and created the RAID 1.
The trouble is: this will be not part of your /root/initial-setup-ks.cfg
file after installation completes. That means, you will have to do that
part (which basically makes drives members of software RAID - mirror)
before kickstart installation on each box. Or you may need to add this
part at the very top of your kickstart file, followed by something like

 mdadm --assemble --scan

- I'm not certain though to what extent it is doable. I'm a
"hardware
RAID" guy...

Valeri
> I went back to
> the GUI, and tried to rescan... it didn't find it, didn't show any
drives,
> then it showed the two real drives... then it gagged, and crashed, and
> rebooted. HOWEVER, when I tried the next time, anaconda's probing found
> the RAID, and I'm installing now.
>
> *phew*
>
>          mark
>
>
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> CentOS at centos.org
> https://lists.centos.org/mailman/listinfo/centos
>

++++++++++++++++++++++++++++++++++++++++
Valeri Galtsev
Sr System Administrator
Department of Astronomy and Astrophysics
Kavli Institute for Cosmological Physics
University of Chicago
Phone: 773-702-4247
++++++++++++++++++++++++++++++++++++++++

So, it installed happily.

Then wouldn't boot. No problem, I'll bring it up with pxe, then chroot
and
grub2-install.

Um, nope. I edited the device map from hd0 and hd1 being the RAID to
/dev/sda and /dev/sdb, then ran grup2-install. It now tells me can't
identify the filesystem on hd0, and can't perform a safety check, and
gives up.

What am I missing? Google is not giving me any answers....

      mark