Re: RAID start at boot
On Tue, Feb 22, 2011 at 09:22:29PM -0500, Tom H wrote:
> On Tue, Feb 22, 2011 at 8:45 PM, Andrew Reid <reidac@bellatlantic.net> wrote:
> >> Is there a way to make sure my RAID (level 1) won't be started degraded? On
> >> boot, one disk is found before the others, and the RAID is started before
> >> the others are seen. (They are seen at different times because I am
> >> transitioning from USB to eSATA, and the one eSATA disk is seen before any
> >> USB disk.) I start my RAID manually anyway (not as part of the boot
> >> process), so I'd be just as happy if it was never automatically started,
> >> but I *really* don't want it started with just one disk.
> >
> > ?According to the mdadm.conf man-page, you can specify an array
> > with the name "<ignore>" in that file (and rebuild the initramfs,
> > presumably), and this will cause mdadm to never automatically
> > assemble the array.
> >
> > ?You could then presumably assemble it "by hand" specifying
> > the name to mdadm -A <whatever> later on.
> >
> > ?I actually checked the man-page because I was *sure* there
> > was a "--no-degraded" option in there somewhere. ?There is such
> > an option for the mdadm command, but it's not clear if it can
> > be gotten in to the boot-time environment or not.
>
> You can also take a look and change
> # INITRDSTART:
> # list of arrays (or 'all') to start automatically when the initial ramdisk
> # loads. This list *must* include the array holding your root filesystem. Use
> # 'none' to prevent any array from being started from the initial ramdisk.
> INITRDSTART='all'
> in "/etc/default/mdadm" before running update-initramfs or dpkg-reconfigure.
Ah, this looks really promising. Thank you. I'll see whether it worked the
next time I reboot (which, I hope, won't be for a few hundred days).
--Greg
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