Jon Dama wrote: >Request Barriers under linux exist to prevent the low level kernel block >device layer from reordering write operations from the upper file system >layers. Request Barriers consist of nothing more than tagging internal >queues within the Linux kernel itself. They do nothing to resolve the >underlying failures of the hardware to provide proper semantics to the >block device layer. >but, Request Barriers are ultimately useless. They can't resolve the >underlying problems with ide/sata and there are already exposed semantics >for scsi. If you flush the cache at barriers, on-disk integrity of the journal vs. metadata updates is guaranteed. mkb. _______________________________________________ freebsd-stable@xxxxxxxxxxx mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscribe@xxxxxxxxxxx"