From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christian Pernegger Subject: Re: unbelievably bad performance: 2.6.27.37 and raid6 Date: Mon, 2 Nov 2009 19:51:50 +0100 Message-ID: References: <4AEEF29C.10309@tmr.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Return-path: In-Reply-To: <4AEEF29C.10309@tmr.com> Sender: linux-raid-owner@vger.kernel.org To: Linux RAID List-Id: linux-raid.ids > It is really slow, recent kernels seem to be unsuitable for use as large > file servers, as the performance is, as you described it, "unbelievably > bad." Is this raid6 specific? Because FWIW md performance has been fine (not great, but fine) on my little raid5/10 file servers. As soon as I add dm-crypt to the mix it all goes to hell, though. Maybe it's a device-mapper thing? Is everybody affected using LVM? C.