Re: Raid 5

[Gary Dale <garydale@rogers.com>]

On 06/03/13 01:55 PM, Dick Thomas wrote:
> About.me http://about.me/dick.thomas
> Blog: www.xpd259.co.uk
> G+:   www.google.com/profiles/xpd259
> gpg key: C791809B
>
>
> On 6 March 2013 18:47, Adam Wolfe<kadamwolfe@gmail.com>  wrote:
> > I had one h**l of a time doing this over the weekend.
> >
> > What finally worked for me was creating LOGICAL partitions on each drive and
> > setting them as used for RAID volume devices.
> > This gave me /dev/sda5, /dev/sdb5 etc etc.
> > When grub did it's install, it added all the /dev/sda1 etc partitions and
> > rebooted fine.
> >
> > When I tried primary partitions, grub would just fail and I'd have to
> > restart the whole install process over.
> >
> > NOTE:  when booting from the install cd i had to [tab] the 'install' menu
> > entry and add "dmraid=true".
> > Then after the initial install, it would still fail to boot.
> > Back to the install cd, choose 'rescue', [tab] and add 'dmraid=true' again.
> > Then get thee to a shell and 'grub-install --recheck /dev/sdaX' for each
> > partition.
> >
> >
> >
> >
> > On 03/06/2013 01:37 PM, Dick Thomas wrote:
> > > What is the best way to setup a raid 5 array (4* 2TB drives)
> > > should I make raid 5 for my system and /home
> > > then raid 0 or 1 for the boot, or should I buy a 5th drive for
> > > system/boot and install in the standard way?
> > > as this is my 1st time on debian and not sure what would be best
> > >
> > >
> > > Dick Thomas
> > > About.me http://about.me/dick.thomas
> > > Blog: www.xpd259.co.uk
> > > G+:   www.google.com/profiles/xpd259
> > > gpg key: C791809B
> >
> > --
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>
> I've tried installing from my "hardware" motherboard raid and that
> just fails even with dmraid=true
> atm i've got a
> raid 0 /boot
>
> raid 5 encrypted then /lvm
>           /lvm/swap
>           /lvm/root
>          //var/log
>
> but wasn't sure if that was the way to do it
> or am I just confusing matters more :)
Do NOT use the hardware RAID. It's just a crippled form of software RAID.

Ignore the advice from Adam Wolfe - it's nonsense. Use the Debian 
installer (advanced mode) to create the RAID 5 array on drives with just 
one partition (whole disk) as /dev/md0. Then partition the RAID 5 array 
into / and /home. Install and reboot.

If you are using Wheezy this will work directly. If you are using 
Squeeze then you may need to fix the UUID in /boot/grub.cfg.

I've done this successfully several times. It just works.