[G4] EIDE and Ultra ATA RAID

[shopdog]

Philip:

Thanks for the information.  I will try to find some of those 
tutorials. I'm a little wary about using a RAID system.  I asked the 
question because I tested a mirrored RAID system once, in the following 
manner.  Maybe you all can educate me on what I should have done 
instead...

I set up 2 firewire (wall powered) hard drives (same make, same size) 
in a mirrored array using OS X's disk utility.  I saved a file to the 
array.  I restarted the computer (I have a 12" PowerBook) with both 
drives attached, and the array and the file were fine.  I shut down the 
computer, and disconnected one of the drives.  I started the computer, 
and the system showed the array as corrupted, and of course, I couldn't 
get to the file.  I shut down the computer, reattached the drive (so 
both drives were attached as before), and then started the computer.  
The system showed the array still corrupted.

I was wondering, if the drive I had disconnected could not be replaced 
(say it had mechanically failed), how would I have been able to get the 
file off the one drive?  Or would I have to get a new drive and rebuild 
the array to get the file.

Thanks for any insight....

shopdog

On Apr 27, 2005, at 7:05 PM, Philip J Robar wrote:

>
> On Apr 25, 2005, at 1:05 PM, shopdog wrote:
>
>> I see.  I didn't understand that you get the array back that way.  I 
>> thought there was a way to pull the file off the one drive.
>
> Sorry I wasn't clearer. With RAID 1 (mirroring) you can still access 
> your data if half of the mirror dies. You can also rebuild the mirror 
> after the failure without having to restore the data.
>
>> Can you please explain in more detail the concatenation setup you 
>> described?  I'm not sure I quite understand...
>
> There are lots of tutorials on RAID available on the net. The set up I 
> described is referred to as RAID 0+1.
>
> Phil
>
> _______________________________________________
> G4 mailing list
> G4 at listserver.themacintoshguy.com
> http://listserver.themacintoshguy.com/mailman/listinfo/g4
>
> Listmom is trying to clean out his closets! Vintage Mac and random 
> stuff:
>         http://search.ebay.com/_W0QQsassZmacguy1984