On Friday February 21, soul@lamp-post.net wrote: > I was wondering if it would be possible to set aside a large (larger) > amount of system memory to act as cache for software raid. > I have a few xeon systems here with 4-8gb of memory in them and based on > watching the performance of some mylex raid cards > jump up when we did a memory upgrade from 64mb -> 128mb I was wondering > if the same would occur in linux. > > If this is even something doable (tweakable) Im wondering what the perf > gain from allocating say 2 or 4gb just to raid cache would be. > > Comments ? How do you imagine this extra 'cache' would be used. Cache on raid cards tends to be battery backed (I believe) and to operate as a write-behind cache thereby increasing performance. As main system memory is not battery backed, you cannot use it as a write-behind cache. NeilBrown - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
