[CentOS] preferred software RAID 10?

Ross S. W. Walker RWalker at medallion.com
Thu Jul 17 22:44:26 UTC 2008

Kai Schaetzl wrote:
> Rudi Ahlers wrote on Thu, 17 Jul 2008 23:10:48 +0200:
> > > /boot shouldn't be mirrored, as the BIOS won't know how to boot it. 
> > > leave /dev/sdb1 the same size as /dev/sda1 and call it /boot2 and try 
> > > to remember to copy /boot to /boot2 each time you update the kernel.
> > I understand this, but how do you boot from /boot2 on the second HDD if 
> > the 1st have failed?
> You don't (*). I don't understand John's advice here. There is no problem 
> md mirroring /boot. You just need to install grub a second time on the 
> other disk. For that you have to boot from it. (I think I also did it 
> successfully without booting from the other disk in the past, but last 
> time I tried it it didn't want to work like I remembered it should.)
> (*) Anyway, you would boot from a Rescue CD or such and rename it ...

Yes, no problems, I had /boot mirrored across 4 drives (NAS box) and
grub installed on each.

If you use labels for /boot in fstab you don't even need to edit fstab
from a rescue CD, just remove the failed first drive and boot.


This e-mail, and any attachments thereto, is intended only for use by
the addressee(s) named herein and may contain legally privileged
and/or confidential information. If you are not the intended recipient
of this e-mail, you are hereby notified that any dissemination,
distribution or copying of this e-mail, and any attachments thereto,
is strictly prohibited. If you have received this e-mail in error,
please immediately notify the sender and permanently delete the
original and any copy or printout thereof.

More information about the CentOS mailing list