Re: raw aio write guarantee

[Kyle Moffett <mrmacman_g4@mac.com>]

On Sep 28, 2005, at 12:42:50, iodophlymiaelo@gmail.com wrote:
> Erm, is the hardware problem really as great as you're implying?  
> Have you personally encountered any bad drives made by reputable  
> brands? Mostly I've only heard only of people crying wolf and then  
> realizing it was a problem with their reasoning or with the  
> assumption that fsync() actually works properly on kernel X, where  
> X doesn't even have to be that ancient a version of linux ;-)
No, I've seen several sample cases on this list of drives where the  
IDE or SCSI cache flush commands did not trigger any disk activity  
and the only way to force it out of the cache was to write several  
meg of garbage to some file.  In some cases (Like RAID cards with  
good battery backup, for example), they may ignore the flush cache  
command as it isn't really useful (although on such good cards, they   
usually haw a way to turn it off, too).
Cheers,
Kyle Moffett

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