On Tue, Jun 11, 2013 at 03:05:07PM +0000, OS Engineering wrote: ... > Dm-cache commits on-disk metadata every time a REQ_SYNC or REQ_FUA > bio is written. If no such requests are made then it commits > metadata once every second. If power is lost, it may lose some > recent writes. Not true (though it is true for thinp, which may be where you got this idea?). For caching we have to commit whenever data is moved about, otherwise a crash could result in us reading data that is not just out of date (acceptable for some), but used to belong to a totally different part of the device (always unacceptable). - Joe -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
