Posted May 14, 2012 20:07 UTC (Mon) by blitzkrieg3 (subscriber, #57873)
Parent article: A bcache update
> Obviously, writeback caching also carries the risk of losing data if the system is struck by a meteorite before the writeback operation is complete.
It isn't clear to me why this is true. SSDs are persistent storage and the data is still in the SSD, so why can't this be persistent? The only way this could be a problem is if the mapping is in memory and not written out to the SSD ever.