PERC 4e/DC in 2850 - lost 1 disk, RAID5 array failed

[Sander Steffann]

Hi,	

> I eventually had to hard reboot the server, and upon reboot, the PERC 
> complained that one disk had failed and that the array was in 
> a degraded 
> state.  Since it did not want to serve up the data, I'm now trying to 
> rebuild that disk from the BIOS, but I thought all of this 
> could be done 
> online, while still serving data, and not having 12 hours of downtime 
> while the disk rebuilds!
> 
> Am I not understanding this, or did this PERC completely fail?

The PERC failed. A RAID5 array should never lose data when one drive fails.
(you will lose data when a second drive fails, but your data should be ok
with one drive failing)

- Sander