[mythtvnz] File System for RAID-5

[James Booth]

I've set up a trial RAID 1+0 using Tim's layout as below, and it's all fine. I 
have one last question.



Tim, using your setup, if I am running RAID 1+0 then will it be possible to 
add another disk later on without having to back all the data up first? (I'd 
try it, but don't have a spare disk to hand). Could I add in drive D as per 
your example, and then automatically grow the RAID 0 across the top? I have 
not been able to find a definitive answer on this on the net.



Same goes for RAID10,F2 - if I go this route can I just automatically grow the 
system with an extra disk later on?



Thanks for your help.



> > Say you get a new 500GB drive, 'D'. If you're willing to stick to 250GB
> > arrays (rather than reconfiguring to 500GB arrays) you can add the new
> > drive while ensuring that you always have two copies of everything.
> > Partition the new drive into two 250GB partitions. Then add partition D2
> > to array 3 (so array 3 has 3 copies of the data). Once the array has
> > sync'd you have: Array 3: C1 A2 D2
> >
> > Now remove partition A2 from array 3. Finally set up a new array using D1
> > and A2. So you end up with:
> > Array 1: A1 B2
> > Array 2: B1 C2
> > Array 3: C1 D2
> > Array 4: D1 A2 (empty)
> >
> > If you're not worried about maintaining two copies of everything during
> > the process you can do this: create a new array out of the new drive D.
> > Set it up with a missing copy. Remove C from arrays 2 and 3. Set up
> > another array with drive C and a missing copy. At this point you have:
> > Array 1: A1 B2
> > Array 2: B1 -
> > Array 3: - A2
> > Array 4: D - (500GB)
> > Array 5: C - (500GB)
> > Copy everything from arrays 1, 2, and 3 to arrays 4 and 5 however you
> > like. Then delete arrays 1, 2, and 3 and add drives A and B to arrays 4
> > and 5. Once they sync you'll have:
> > Array 4: D A
> > Array 5: C B
> >
> > Expanding a (mdraid) RAID10 is not so easy but I recommend it if you're
> > not likely to expand often as the performance can be much better. You can
> > set it up so that a single filesystem is striped across the 3 or 4 drives
> > without needing LVM on top.
> >
> > Cheers,
> > Steve
> >
> >
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