Re: Linux 2.6.29

Mark Lord
2009-03-30T20:40:52Z

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