[CentOS] 75% - 80% Rebuild Complete

Thu Jun 7 21:48:19 UTC 2012
Scott Silva <ssilva at sgvwater.com>

on 6/7/2012 9:40 AM Bowie Bailey spake the following:
> On 6/5/2012 7:21 PM, Eugene Poole wrote:
>> OK,  I'm about 90% sure that I've corrected the boot loader situation 
>> with RAID-1 and the second hard drive.  I haven't tested the correction, 
>> but here's what I did:
>>     Examined the grub.conf file and noticed that hd0 uses (hd0,1), so
>>     what followed was
>>     grub
>>         grub> device (hd1) /dev/sdc
>>         grub> root (hd1,1)
>>         grub> setup (hd1)
>>         <after receiving the successful message>
>>         grub> quit
>> I didn't rebuild the boot loader on /dev/sda because it is working (if 
>> it ain't broke don't fix it).
>> My situation is that I'm using 4 - 1 TB hard drives and I used the 
>> following pattern:
>>     /dev/sda | /dev/sdc = First Raid -1 volume
>>     /dev/sdb | /dev/sdd = Second Raid-1 volume
> There is no complete solution to this problem.  The question is this: 
> When one of the drives dies, how will the system see the remaining
> drive?  Will it still see it as sdb, or will it now see that drive as
> sda?  These situations need different grub configs.  I generally
> configure both drives as if they were hd0/sda.  That way, if sda
> crashes, I can remove the disk and boot the second drive normally.
In older versions sdb would become sda, but I don't have enough time on the 6
series to know for sure... Maybe I will fire up a virtual machine with a
couple emulated sata drives and see....