Raid definitions

Stephen Carville stephen at totalflood.com
Fri Jan 19 10:36:42 UTC 2007


Lord of Gore wrote:
> McDougall, Marshall (FSH) wrote:
>> I am in the process of allocating drive space in several new servers.
>> Each of these servers are to house DB's of some sort.  Each has 6 X 146
>> gig drives and each will run RHES4.  I was thinking of 2 arrays:
>>
>> 1 - mirrored pair of 146's for OS
>> 1 - Raid 5 array with 4 x 146 for db's.  That would give me a disk of
>> about 440 GB.
>>
>> Currently, the biggest DB is about 30 GB.   I figure there are just too
>> many ways that I can slice and dice it.  Any advice appreciated.
>> Thanks.
>>
>> Regards, Marshall
>>   
> I'd go with level 5 for the extra space. Fault tolerance is the same: 
> just 1 broken disk per "session" :) .
> 

A four disk RAID 10 set can lose up to two drives without failing as 
long as both are not in the same mirror set.  RAID 10 has much better 
read and write performance than RAID 5. Should a drive fail, rebuilds to 
the replacement drive are faster making the window for a catastrophic 
failure less.

-- 
Stephen Carville <stephen at totalflood.com>
Unix and Network Admin
Nationwide Totalflood
6033 W. Century Blvd
Los Angeles, CA 90045
310-342-3602




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