[ML-General] hardware RAID

[Brian Oborn]

On Thu, Jun 11, 2015 at 4:49 PM, WebDawg <webdawg at gmail.com> wrote:

>
>
> On Thu, Jun 11, 2015 at 2:41 PM, david <ainut at knology.net> wrote:
>
>>  Software Linux raid is fine with the striping but it sucks at
>> mirroring.  The second (mirror) drive is NOT identical in any shape form or
>> fashion.  Even the partitions are different.  And it is not bootable!!!  In
>> mirroring, I want immediate fail-over, or at most, one shutdown,
>> remove/replace drive, then back up right where I was.
>>
>> Thanks,
>> David
>>
>
> I agree.  I had to go through hell with a Debian mdadm system to install
> the boot loader on both drives.  I know this is a problem with a few
> software raid solutions.
>
>
> Anyone know if this has been fixed in any OS + Filesystem/Software Raid?
> One of the things that killed me was if the bootloader was corrupted on one
> disk, or the disk was partially corrupted or something, in a software raid
> scenario, the bios has to know to move to the next disk, but when does that
> ever happen?
>
> This was a big failing with software raid.  I am sure it could be hacked
> around by placing the bootloader somewhere else...or something.
>
>
Again, this isn't a problem with the software RAID, but just how Linux
works. mdadm doesn't know anything about the MBR since it's not in a
partition. Instead you configure the bootloader to install itself on the
MBR of both drives. IIRC some installers (Debian maybe?) offered to do this
for you.
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