Software raid tutorial and hardware raid questions.

[Charlie Kravetz]

On Sat, 2008-06-07 at 10:19 -0600, drew einhorn wrote:
> I remember seeing one with an example migrating 
> from an old fashioned filesystem on a partition
> to a new filesystem on a mirrored lvm logical volume
> but one only one side of the mirror is set up at this
> time.  
> 
> First I need to copy stuff from what will become 
> the second side of the mirror 
> to filesystem on the first side or the mirror
> 
> Then I will be ready to follow the rest of the tutorial
> and build and attach the second side of the mirror.
> 
> Wish I could remember where I saw that tutorial.
> 
> Want to embellish the example and stripe each side
> of the mirror.
> 
> Understanding  a mirrored pair of stripes, 
> seems easier than 
> understanding a striped pair of mirrors.
> 
> But this seems like a place where
> counterintuitive results are not a big surprise.
> 
> I can do mirroring and striping in lvm, mdadm,
> or a hardware raid controller.  There are lots of
> configurations to ponder.
> 
> What about recovery after a hardware raid controller?
> 
> What are the chances of being able to replace the controller
> and start up successfully from drives?  I know that assuming
> the failed controller did write bad stuff to the drives while
> it was crashing and burning.
> 
> I would not be surprised if the controller firmware revisions
> had to match.  I would be surprised but not astonished if 
> the board hardware revision level had to match, too.
> I hope we are past those days.
> 
> Anybody know about the 
> LSI Logic MegaRAID 8480 Storage controller
> in particular.
> 
> 
> -- 
> Drew Einhorn

I don't know about the MegaRaid 8480, but maybe this is the reference
you are looking for?
https://help.ubuntu.com/community/Installation/LVMOnRaid
It was written while he migrated from the old system to the LVM system.

Good Luck,

-- 
Charlie Kravetz 
Linux Registered User Number 425914          [http://counter.li.org/]
Never let anyone steal your DREAM.           [http://keepingdreams.com]