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

[Fran Fabrizio]

But isn't the point of RAID5 that it'll keep running with the loss of a 
single disk?  Am I completely confused?  Yes, I know I need to rebuild 
the disk, but I should be able to do that and at the same time the 
system should still be able to serve requests while it is missing one disk.

eclark wrote:
> Use afacli or dellmgr. Both can do it. There is detailed documentation on how 
> to rebuild a raid5 with these tools. For afacli, refer to 
> 
> http://linux.dell.com/files/aacraid/aacraid_monitoring_script.txt
> 
> as this explains how to do automated testing of raid5 integrity.  Check dells 
> website for the docs on afacli and dellmgr.
> 
> On Friday 07 July 2006 08:50 am, Fran Fabrizio wrote:
>> 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