On Tue, 13 Oct 2009, Asdo wrote:
I have heard mixed opinions about 3wares. What are the fastest controllers around for MD-raid use?
The 3wares are not the fastest around, I don't even get the performance you're describing. I use them because I can get them cheap on the used market and because they're stable.
There are plenty of articles around describing read/write latency for the 3wares as one part of the problem. Just to put into perspective, I get approx 5-10 megabyte/s write performance on a 3ware 9500S hw-raid5 with ext3, whereas I get at least 10x times that for read. The performance with dd directly to the device is 100+ megabyte/s though, it's just thru the fs it is slow.
The 3wares usually work better if you single disk them and use md, then I get 30-50 megabyte/s write performance thru the fs anyway, which is what I guess you do as well.
-- Mikael Abrahamsson email: swmike@xxxxxxxxx -- 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
