LINUX RAID -ECC

[Szima Gábor]

On Sun, 18 Sep 2005, Nagy Endre wrote:

> hattersugarzasra meg elsosorban az urben kell 
> szamitani. Persze van idelent is valamennyi, de a passzivalo reteg 
> vastagsagat ugy valasztjak meg, hogy ne tudjon bithibat okozni.

Ezt talaltam a temaban:

http://www.promarktech.com/storage/connectivity/qlogic/SANblade_2300_series.htm

"How Cosmic Rays Cause Computer Downtime"

"High energy neutron interaction with SRAM memory cells:  Typical SRAM 
neutron induced SER ~1 kFIT/Mbit (1 FIT/Kbit) with 1-5% multicell upsets. 
ĎUp to ~0.5% of all neutron induced SE result in multicell errors accessed 
simultaneously. ĎSpacing of cells is critical to limit multibit errors in 
a single access.  4MB (~38Mbit) SRAM => ~38000 FIT or ~0.32 fails/year 
without protection. With 1 bit ECC correction the uncorrected SER is less 
the 2000 FIT and less than 1 FIT with sufficient bit spacing."

FIT: Failures in Time, which is measured at 1 billion hours



 								-Sygma