Does anyone know the inteded actual duty cycle for the WD Red’s MTBF value?
Thanks in advance for any hints,
regards, Urk
Check the link below for info on that.
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WD Red Series Disti Spec Sheet:
http://www.wdc.com/wdproducts/library/SpecSheet/ENG/2879-771442.pdf
The above document specifies a MTBF of 1 million hours “based on a typical NAS product environment under normal operating conditions”. I guess this means “always on 24x7” operation. However, it doesn’t specify the allowable temperature range. The article in Alucardx23’s link doesn’t clarify these conditions, either.
As for Annualized Failure Rate …
AFR = 8760 / MTBF = 8760 / 1,000,000 = 0.88%
Unfortunately that link has about nothing to do with the actual duty cycle of WD Red drives, which is a percentage value.
Moreover, that 2009 FAQ does not apply to WD RED drives.
AFD, MTBF and POH, in order to be declared all they assume a given duty cycle (10%, 20%, 30%, … 100%), which is what I’m looking for.
In the RED’s OEM sheet, WD also states that reliability data (MTBF, POH) only applies in a “Typical consumer/SOHO NAS workload at room ambient temperature.”
They don’t specify what - according to WD - a “SOHO NAS workload” is (definitely without duty cycle and temperature ratings, POH and MTBF values are pretty useless, and intentionally misleading).
