RSYNC Fedora

[Scott Burns]

Eric J. Feldhusen wrote:

>
>
> Example,
>
> A computer with 4 - 100GB hard drives in a RAID 1 (mirroring), set up 
> a mirror with 2 hot spares. Total storage - 100GB, but you can have 3 
> drive failures and the system can keep running.

In the event of two drive failures close together (second goes while 
rebuilding ), isn't there a small window of time that you'd only need to 
lose two to suffer complete data loss?  Would it be better to have 3 
active with one hot spare?

>
> A computer with 4 - 100GB hard drives in a RAID 5 (parity) set up, 3 
> drives are active in the RAID 5, 1 hot spare drive, Total storage 
> 200GB, actually a little less due to overhead. In this configuration, 
> one of the drives in the raid fails, the hot spare becomes active, the 
> raid rebuilds, and you replace the dead drive with a fresh drive and 
> this drive becomes the hot spare.  In this case, you can have 2 drives 
> fail and the system can keep going.
>
Same deal as above, what happens if a second drive fails during rebuild?

-- 
Scott Burns
Mirrabooka Systems

Tel +61 7 3857 7899
Fax +61 7 3857 1368