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Re: raid1 bootable disks

On Friday 04 August 2006 14:51, Scott Reese wrote:
> A J Stiles wrote:
> > end up configuring it to boot from sdb.  But the way most motherboards
> > work is that, if the first drive fails Power On Self Test, then it will
> > be ignored and the second drive will be assigned as sda.  So the
> > bootloader on the second drive must be configured to boot from sda.
> Greetings:
> In my experience, what any random motherboard will do in the event of a
> missing drive is completely unpredictable.  Every manufacturer is
> different, and different boards from the same manufacturer can behave
> differently.  Lately, with SATA drives, it seems that it is more common
> for the drive's ID to be determined by which connector on the
> motherboard (or add-on controller) it is plugged into.  When we lose sda
>  on our HP servers, sdb remains sdb.
> In any event, we've found grub boot floppies or boot USB sticks to be
> invaluable.

That sounds interesting. Could you recommend the directions for grub on mbr at




> You boot from that and get a full grub console, where you 
> can direct the loader to boot from any available drive in the machine
> and pass whatever root disk parameters are appropriate.
> Always test you configuration before you put it into production.
> Spending 20 minutes pulling sda from the machine and booting it up to
> see what happens will tell you everything that you need to know.
> -Scott

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