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Old 04-08-2011, 10:51 PM
Mark Busheman
 
Default ext3 and forced unit access to flush disk cache

I plan to use data=journal option with ext3 for a customer who is very
specific about the integrity of the data. Would like to know if ext4
send FUA (Forced Unit Access) to flush the disk cache?

Cheers
Mark

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Old 04-13-2011, 07:34 PM
Ric Wheeler
 
Default ext3 and forced unit access to flush disk cache

On 04/08/2011 06:51 PM, Mark Busheman wrote:

I plan to use data=journal option with ext3 for a customer who is very
specific about the integrity of the data. Would like to know if ext4
send FUA (Forced Unit Access) to flush the disk cache?

Cheers
Mark



ext4 by default uses "barrier" support and will issue the write commands
(depends on the storage type). You can "mount -o barrier" ext3 as well.


It will do this for its own metadata reasons and as part of an application
driven fsync() command, so the customer data should be safe if their application
is coded properly.


Regards,

Ric

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