Re: [gentoo-user] RAID-1 on secondary disks how?

[Mick]

On Tuesday, 29 January 2019 16:08:27 GMT Peter Humphrey wrote:
> On Tuesday, 29 January 2019 09:20:46 GMT Mick wrote:
>
> Hello Mick,
>
> --->8
>
> > Do you have CONFIG_MD_RAID1 (or whatever it should be these days) built in
> > your kernel?
>
> Yes, I have, but something else was missing: CONFIG_DM_RAID=y. This is in
> the SCSI section, which I'd overlooked (I hadn't needed it before because
> the main storage is an NVMe drive). After setting that and rebooting, mdadm
> --create is working as expected.

Good!  I had assumed this was already selected.  ;-)


> > You need to update your initramfs after you configure your array, so your
> > kernel knows what to assemble at boot time when it doesn't yet have access
> > to your mdadm.conf.
>
> I'd rather not have to create an initramfs if I can avoid it. Would it be
> sensible to start the raid volume by putting an mdadm --assemble command
> into, say, /etc/local.d/raid.start? The machine doesn't boot from /dev/md0.

I think yes, as long as OS filesystem(s) are not on the array, or not mounted 
until the array has been assembled with the correct mdadm.config.

-- 
Regards,
Mick