[ML-General] hardware RAID

[david]

There was an itsy-bitsy blurb about it on Debian's site but there were 
no details given and, doing Yet Another Fresh Install (copyright), I 
could not find it in any of the auto OR manual disk setups.  <sigh>  
This was less than a month ago.

David


On 06/11/15 16:56, Brian Oborn wrote:
>
>
> On Thu, Jun 11, 2015 at 4:49 PM, WebDawg <webdawg at gmail.com 
> <mailto:webdawg at gmail.com>> wrote:
>
>
>
>     On Thu, Jun 11, 2015 at 2:41 PM, david <ainut at knology.net
>     <mailto: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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