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

[Fran Fabrizio]

To clarify, I'm not saying I lost data, I'm saying I lost -access- to 
the data.  I had to rebuild the failed drive in order to regain access. 
  All drives in the array had to be online for me to access the data. 
Once a drive failed, I started losing the ability to read the data.

Sander Steffann wrote:
> 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
> 
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-- 
Fran Fabrizio
Senior Systems Analyst
Department of Computer and Information Sciences
University of Alabama at Birmingham
http://www.cis.uab.edu/
205.934.0653