Re: Linux 2.6.29

[Mark Lord]

Jeff Garzik wrote:
> Mark Lord wrote:
> > Michael Tokarev wrote:
> > > But are there drives out there that actually supports FUA?
> > ..
> >
> > Most (or all?) current model Hitachi Deskstar drives have it.
>
> Depends on your source of information:  if you judge from probe 
> messages, libata_fua==0 will imply !FUA-support.
..

As your other post points out, lots of drives already support FUA,
but libata deliberately disables it by default (due to the performance
impact, similar to mounting a f/s with -osync).


For the curious, you can use this command to see if your hardware has FUA:

  hdparm -I /dev/sd? | grep FUA

It will show lines like this for the drives that support it:

 *    WRITE_{DMA|MULTIPLE}_FUA_EXT

Cheers
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