On Mar. 25, 2009, 22:16 +0200, Jeff Garzik <jeff@garzik.org> wrote:
quoted text
> Ric Wheeler wrote:> And, as I am sure that you do know, to add insult to 
> injury, FLUSH_CACHE
>> is per device (not file system).
>>
>> When you issue an fsync() on a disk with multiple partitions, you will 
>> flush the data for all of its partitions from the write cache....
> 
> SCSI'S SYNCHRONIZE CACHE command already accepts an (LBA, length) pair. 
>   We could make use of that.
> 
> And I bet we could convince T13 to add FLUSH CACHE RANGE, if we could 
> demonstrate clear benefit.

One more example of flexible, fine grain flush (though quite far out) are
T10 OSDs with which you can flush a byte range of a single object
(or collection, partition, or the whole device LUN)

Benny

quoted text
> 
> 	Jeff
> 
> 
> 
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