From mboxrd@z Thu Jan 1 00:00:00 1970 From: pg@lxra2.for.sabi.co.UK (Peter Grandi) Subject: Re: raid5 write latency is 10x the drive latency Date: Mon, 3 Mar 2014 23:29:38 +0000 Message-ID: <21269.4194.236349.136774@tree.ty.sabi.co.uk> References: <21268.65296.503057.601739@tree.ty.sabi.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <21268.65296.503057.601739@tree.ty.sabi.co.uk> Sender: linux-raid-owner@vger.kernel.org To: Linux RAID List-Id: linux-raid.ids > [ ... ] Which tool settings? [ ... ] As to this, how are the 8KiB writes aligned? To 1KiB? 4KiB? 8KiB? To something else? Is there any other activity on the same physical disks given that the RAID members seem to be LVs? Also what's the size of those LV members of the MD set? It may be quite small...