Is my data checksummed?

[Ric Wheeler]

On 02/21/2010 09:41 PM, tytso at mit.edu wrote:
> On Fri, Feb 19, 2010 at 08:15:30PM -0800, Reza Roboubi wrote:
>    
>> What checksumming is done for the actual data?  I know that storage
>> devices often do their own checksumming too, but how can I be sure
>> my data is integrity checked every time I read it?
>>      
> If you use disks that support the Data Integrity Field (DIF)
> extension, Linux will use it to provide end-to-end data checksum
> support.  Otherwise, there are checksums on the disk and between disk
> controller and the CPU, but those are obviously not end-to-end
> checksums.
>    

Just to be clear, even with a storage path that supports DIF/DIX, we 
don't currently do anything for applications on top of file systems. The 
primary application to target storage path is covered mainly for raw 
devices.

ric

> Adding data-level checksums is not something that we are planning on
> adding to the ext2/3/4 file systems.  BTRFS is the only file system
> that has data-level checksums, but it's not yet production ready.
>
> Best regards,
>
> 					- Ted
>
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