On Tue, Jul 27, 2010 at 02:35:46PM -0400, Vivek Goyal wrote: > IIUC, QUEUE_ORDERED_DRAIN will be set only for storage which either does > not support write caches or which advertises himself as having no write > caches (it has write caches but is batter backed up and is capable of > flushing requests upon power failure). More or less. We set it for scsi devices without the write cache enable (WCE) bit, which is only set it there is a volatile write cache that needs flushing. Some historic arrays used to set it despite having a non-volatile write cache, but that doesn't happen anymore with any of the modern ones I have access to. -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
