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Ordered tags are not widely supportedOrdered tags are not widely supportedPosted Aug 19, 2010 20:55 UTC (Thu) by willy (subscriber, #9762)Parent article: The end of block barriers
Apparently the last hard drive to support them shipped about fifteen years ago. I'm told they aren't even available in high-end storage arrays.
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Ordered tags are not widely supported Posted Aug 20, 2010 7:40 UTC (Fri) by butlerm (subscriber, #13312) [Link]
Microsoft was asking that write barriers be added to SATA just three years ago. I don't know if they made any progress. There are several related patents and patent applications out there.
Hitachi, for example, has a patent on transforming a flush cache command into a write barrier in a disk drive, something that is necessary (more or less) to implement an asynchronous cache flush (cf. Patent 7574565, filed 2006, published last year).
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