A little story of failed raid5 (3ware 8000 series)

Artem Kuchin matrix at itlegion.ru
Mon Aug 20 21:58:00 PDT 2007

David Schwartz wrote:
>> A day ago at 11 am i have turn off the server,
>> pull out the old driver, installed a new one, turned of the server
>> and started rebuild in an hour from remote location via web
>> interface. After about 5 minuted the machine became unresponsive.
>> Tried rebooting - nothing. I went to the machine and fingure out,
>> that rebuild failed (0%) and some data cannot be read because of bad
>> sectors. 
> Why would you power cycle a RAID 5 array with a failed drive? That's
> like the biggest no-no that there is. When you lose a drive on a RAID
> 5 array, you are vulnerable until a replacement drive is configured
> and the array is rebuilt. Any high risk operations during that time
> would be foolhardy. 

Um.. it is because i did not have a map of hot swap baskets to conroller
ports and i needed to check every driver basket to understand which port
it sits on. I have no choise, i think.

>> So, no raid5 or even raid 6 for me any more. Never!
> Since RAID6 would have saved you from what presumably was a drive
> failure before a rebuild could be done, it's hard to understand why
> you would say this is a reason to avoid RAID 6. Perhaps you would do
> better to understand your failure and avoid the causes of the failure
> rather than avoiding the things you happened to be using at the time
> of the failure. 
> If you get food poisoning while wearing a blue shirt, the solution is
> not to avoid blue shirts in the future.

Read the post before. I still don't known which driver has the bad sectors.
And it is very posible that EACH driver has them. RAID6 would not help then.


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