[G4] EIDE and Ultra ATA RAID

[Ralph Garrett]

On Apr 25, 2005, at 2:52 PM, Philip J Robar wrote:

> Note that concatenating a bunch of disks to look like a single disk 
> has the same problem as a stripped array - if one drive fails you 
> loose the data on all the drives.

I disagree, concatenating drives is similar to striping but not the 
same. Instead of writing the data to ALL of the drives in the array 
simultaneously, the data is written to one drive till it's full and 
then written to the next drive in the array. If a drive fails in a 
concatenated array, the only data lost is the data on the failed drive 
and any data that may span across the 2 adjacent drives in the array. 
Concatenating/Spanning drives is usually done to increase the storage 
area beyond what single drives can cover and offers no performance 
boost.

Ralph