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

[Maurice Hilarius <maurice@xxxxxxxxxxxx>]

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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With our best regards,

Maurice W. Hilarius        Telephone: 01-780-456-9771
Hard Data Ltd.  FAX:       01-780-456-9772
11060 - 166 Avenue         email:maurice@xxxxxxxxxxxx
Edmonton, AB, Canada       http://www.harddata.com/
   T5X 1Y3

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