From mboxrd@z Thu Jan 1 00:00:00 1970 From: Al Boldi Subject: Re: RAID0 performance question Date: Mon, 19 Dec 2005 14:16:10 +0300 Message-ID: <200512191416.10665.a1426z@gawab.com> References: <437E2CB6.2030903@xss.co.at> <200512022253.17282.a1426z@gawab.com> <00fd01c60367$d8d8f5d0$0400a8c0@dcccs> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <00fd01c60367$d8d8f5d0$0400a8c0@dcccs> Content-Disposition: inline Sender: linux-raid-owner@vger.kernel.org To: JaniD++ Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids JaniD++ wrote: > For me, the performance bottleneck is cleanly about RAID0 layer used > exactly as "concentrator" to join the 4x2TB to 1x8TB. Did you try running RAID0 over nbd directly and found it to be faster? IIRC, stacking raid modules does need a considerable amount of tuning, and even then it does not scale linearly. Maybe NeilBrown can help? -- Al