Re: Software RAID FAILED!

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HARDWARE
1. Super Micro 1u server
2. sata HD's ( Maxtor I think )

I should mention that I have had problems with this RIAD in the past.
One of the drives was marked faild and I had to fromat it and add it
back in ( hotadd).

captgoodnight captgoodnight wrote:
> What's the hardware?
>
> Software raid, grrrrr....
>
> --eddie
>
>
>>From: Damien Hull <dhull@digitaloverload.net>
>>To: aklug@aklug.org
>>Subject: Software RAID FAILED!
>>Date: Mon, 24 Apr 2006 11:09:56 -0800
>>
> Last week I had a software RAID 1 set fail. It's working now but I am
> wondering what went wrong. I also want to know why I was unable to reboot.
>
> WHAT I'VE GOT
> 1. CentOS 4.2
> 2. /dev/md0 = boot, ext3
> 3. /dev/md1 = LVM, ext3, everything else
>
> When I tried to reboot I got something like "Grub loading stage 2". Then
> it went into a grub command shell. I tried booting off one drive and
> then the other. One gave me the above message "Grub loading stage 2" and
> the other gave me a screen of "grub, grub, grub etc..."
>
> After a few hours of pocking this and that I was able to find some info
> on the net. I had to boot the CentOS CD and go into rescue mode. I
> manually setup RAID and rebuilt /dev/md0 and /dev/md1. The system is now
> up and running.
>
> QUESTIONS
> 1. Why did it fail ( drives seem to be fine )
> 2. Why didn't the system reboot from /dev/md0
> 3. Shouldn't one drive still work after something goes wrong?
>
> Question 2 is my big problem. If /boot is on /dev/md0 (RAID1), why
> didn't the system boot?
>
> Adam suggested manually installing grub on both drives. This would
> suggest that placing /boot on RAID doesn't work. That grub either didn't
> get installed on one of the drives or it doesn't know what to do with
> /dev/md0.
>
> Again, I didn't get a boot menu. I got a grub shell off one drive and
> the other just gave me a bunch of grub junk.
>
> Question 3 is also a problem. Why use software RAID 1 if both drives
> won't boot when something goes wrong?
>
> If anyone has anything to add let me know. I'll be searching Google and
> my system log's for answers. I hope to have some of this figured out by
> Friday.
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Received on Mon Apr 24 11:54:26 2006