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Re: jessie won't install/boot on a Dell Poweredge R815

On Wed, 22 Jun 2016, Jeffrey Mark Siskind wrote:
> and attempted
>    mdadm /dev/md0 --add /dev/sda1
>    mdadm /dev/md0 --add /dev/sdb1
>    mdadm /dev/md0 --add /dev/sdc1
>    mdadm /dev/md0 --add /dev/sdd1
>    mdadm /dev/md0 --add /dev/sde1
>    mdadm /dev/md0 --add /dev/sdf1
> but these all failed.

This is the wrong command; it should be mdadm --assemble /dev/md0

And that should only be done if the md0 device doesn't show up in the
initrd when you cat /proc/mdstat.

What's happened is that the raid1 device now has 12 drives instead of 6,
which basically isn't going to work at all.

You should be able to just directly reinstall jessie on this machine;
I'd also zero out the superblocks on the devices in /dev/md0, and then
assuming that the syncing has proceeded enough, you should be able to
install grub with an appropriate rootdelay and get it to boot. (Again,
in theory.)

Don Armstrong                      https://www.donarmstrong.com

The computer allows you to make mistakes faster than any other
invention, with the possible exception of handguns and tequila
 -- Mitch Ratcliffe

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