Louis-David Mitterrand wrote:
On Mon, Jan 02, 2006 at 01:01:44PM -0800, Mike Fedyk wrote:
Administrator TOOTAI wrote:
Craig Guy a écrit :
Are you using raid for performance or redundancy? Software raid is nice
except when the drive that fails is the one with your boot partition on it. I
guess you could always tftp boot the kernel or something.
If you're using GRUB, fallback option allow you to boot on another boot
partition if first failed.
Yes, and if you don't get to GRUB, what do you do?
I very much prefer a Linux software raid setup myself, but you are
depending on the quirks of your BIOS if your primary boot drive dies.
Not really. When you run lilo on your raid1 boot partition it updates
the MBR on _both_ drives which are thus equally capable of booting you
back into your raid (1 or 5) root partition.
That still depends on your BIOS to skip the first drive if it can't read
the MBR. I have seen several BIOSes do this with drives that report
their existence, but still fail to return the data needed to boot from MBR.
Admittedly this was with desktop hardware instead of server systems, but
that does not invalidate my point. Booting from SW raid depends on the
BIOS handling failure modes very well. It is the same with HW raid, but
you might expect them to test that more since that is the primary
function of the HW raid controller.
Even if you hit a BIOS with this problem, it can be worked around with a
PCI controller card that you test to respond properly to failure conditions.
I still prefer SW raid, but that does not blind me to the problems that
can come from that choice.
Mike
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