Christoph Hellwig wrote: > On Mon, Aug 23, 2010 at 04:01:15PM +0200, Jens Axboe wrote: >> The problem purely exists on arrays that report write back cache enabled >> AND don't implement SYNC_CACHE as a noop. Do any of them exist, or are >> they purely urban legend? > > I haven't seen it. I don't care particularly about this case, but once > it a while people want to disable flushing for testing or because they > really don't care. > aacraid for one falls into this category. SYNC_CACHE is no-oped in the driver. Otherwise you get a _HUGE_ performance loss. Cheers, Hannes -- Dr. Hannes Reinecke zSeries & Storage hare@xxxxxxx +49 911 74053 688 SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: Markus Rex, HRB 16746 (AG Nürnberg) -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
