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[ale] Need an iso to wipe hard drives.

Fsync only flushes blocks of one file.

Sync flushes all write caches

Drop_caches emties read caches too.  Mostly good for bemnchmarking.


On 4/21/10, Jim Kinney <jim.kinney at gmail.com> wrote:
> On Wed, Apr 21, 2010 at 9:25 PM, Chris Fowler
> <cfowler at outpostsentinel.com>wrote:
>
>> On Wed, 2010-04-21 at 21:11 -0400, Doug McNash wrote:
>> > Yep, but Chris says he did an lseek to write over the file again which
>> > is probably fast enough to only write over the buffer, not the disk.
>>
>> I neglected to say that in the for loop I did a fsync(2).  That is
>> supposed to flush the buffers to disk.  Does it really though?
>>
>>
> I thought fsync would write to the disk which puts it in cache (if used).
> sync was the command to force the disks to write the cache to the platter.
>
>>
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>
>
>
> --
> --
> James P. Kinney III
> Actively in pursuit of Life, Liberty and Happiness
>

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