[mythtv-users] Linux software raid question

[Carl L. Gilbert]

On Thu, 2008-06-05 at 14:13 +1000, Dean Harding wrote:
> Carl L. Gilbert wrote:
> > Hardware is hardware.  If your drive controller blows it blows.  Don't
> > matter if its on the MB or in a card plugged into the MB.  No difference
> > here.
> 
> There's a big difference, actually. If the motherboard dies and you're 
> using software RAID, you can just buy another motherboard and keep 
> going. It doesn't matter what kind of motherboard you buy, it could be 
> from a different manufacturer, even different architecture.
> 
> > I am not claiming HW does something software does not.  You are claiming
> > the superiority of what I assume is FakeRAID.
> 
> Software RAID is not Fake RAID. Software RAID just takes two (or more) 
> regular drives, connected via a regular SATA or PATA interface, and 
> combines them into one logical drive. It's done entirely in software 
> (obviously) and does not require one of those "Fake RAID" controllers.
> 

OK.  but fakeraid at least tries to be transparent to the OS so you can
boot the OS on it.  you cant boot software on the RAID array.
Your /boot partition is not on the raid array.  at least last time mine
was not.


> > So what do you do when one of your drives dies on software RAID?  Put in
> > a new drive and go about your business?  Nope.
> 
> True, there is one extra step:
> 
> raidhotadd /dev/mdX /dev/sdX
> 
> (Of course, if more than one disk dies, it's harder than that, but I'm 
> sure the same is true of hardware RAID as well).
> 
> Dean.
> 

who recreates the partition table on the new drive?  i know you add
partition to the array easy, but...

Its been a while since I did software RAID.  Are you doing 1 jumbo
partition?  last time I did software raid I had to recreate the
partitions then add them to the array one at a time.

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