Re: SuperMicro H8SSL-i (ServerWorks HT1000) -- JMR SATAStor 6x2.5" in 1x5.25" array

Mark Hahn wrote:

>>As does my sidebar on "Near-line Enterprise Disk" here:  
>>  http://www.samag.com/documents/sam0509a/0509a_s1.htm  
>>    
>>
>
>can you cite your source for the statement that MTBF is .4 Mhours?
>I know that was a common figure for desktop drives from 8-10 years ago, 
>but I do also remember seeing a number of ATA disks that claimed MTBF's 
>around 1Mhour.  
>
>I'm guessing you just figured that 
>	1.4 Mhour * (10*5)/(24*7) = .417 Mhour
>
>this is not an unreasonable guess, based on the assumption that a vendor
>would try to carefully minimize the MTBF given the current 3-5 year 
>warranty periods, which are the same as "enterprise" products, but assuming
>a different duty cycle.  I expect return rates are higher than this 
>calculation would lead you to expect though, and therefore vendors would
>either try to get away with lower warranty periods or actually bump up 
>the non-enterprise MTBF to reduce RMA costs.
>
>but it would be nice to have even a hint of actual, factual MTBF's.
>
>  
>
Just to wade in here, the new S-ATA RAID drives from WD ( 2500Yd and
4000YR) have claimed MTBF of 1.2 million hours.
Seagate also have very long MTBFs on their NL 35 models


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