From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kasper Sandberg Subject: raid10 layout for 2xSSDs Date: Mon, 16 Nov 2009 15:29:05 +0100 Message-ID: <1258381745.31633.35.camel@localhost> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids Hello. I've been wanting to create a raid10 array of two SSDs, and I am currently considering the layout. As i understand it, near layout is similar to raid1, and will only provide a speedup if theres 2 reads at the same time, not a single sequential read. so the choice is really between far and offset. As i see it, the difference is, that offset tries to reduce the seeking for writing compared to far, but that if you dont consider the seeking penalty, average sequential write speed across the entire array should be roughly the same with offset and far, with offset perhaps being a tad more "stable", is this a correct assumption? if it is, that would mean offset provides a higher "garantueed" speed than far, but with a lower maximum speed. mvh. Kasper Sandberg