[rescue] Ultra 2 upgrade question...

Steve Sandau ssandau at gwi.net
Tue Apr 5 23:29:24 CDT 2005

Devin L. Ganger wrote:
> on 4/5/2005 4:13 PM velociraptor wrote:
>> 0+1? I can never remember the order
> The first number is the RAID method being used for the first layer of 
> protection, so 0+1 is a pair of stripes put into a mirrored volume, 
> while 1+0 is mirrored disks placed into a stripe.
> 1+0 guards against twice as many failure scenarios, is more resistant 
> against multiple disk failures (one per mirrored pair), and requires 
> less time to rebuild when failed disks are replaced.

Yes. I remember by thinking that RAID 0 is "no RAID" while RAID 1 is the 
simplest of RAIDs, i.e. a mirror.

And as far as SDS goes, I have looked all over for a method to 
explicitly create a RAID 1+0, but all that SDS allows is RAID 0+1. 
However all the docs and posts I have found indicate that a RAID 0+1 
created with SDS will indeed function like a RAID 1+0. We'll see what 
happens when the first disk in my D5200 fails.


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