From mboxrd@z Thu Jan 1 00:00:00 1970 From: "JaniD++" Subject: Re: RAID0 performance question Date: Tue, 22 Nov 2005 02:14:31 +0100 Message-ID: <00ce01c5ef02$2192f7a0$a700a8c0@dcccs> References: <437E2CB6.2030903@xss.co.at> <200512022253.17282.a1426z@gawab.com> <00fd01c60367$d8d8f5d0$0400a8c0@dcccs> <200512191416.10665.a1426z@gawab.com> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Return-path: Sender: linux-raid-owner@vger.kernel.org To: Al Boldi Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids ----- Original Message ----- From: "Al Boldi" To: "JaniD++" Cc: Sent: Monday, December 19, 2005 12:16 PM Subject: Re: RAID0 performance question > 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? At this time i cannot test it, because the system is loaded, and the result will fase. Anyway i will probe this.... > > IIRC, stacking raid modules does need a considerable amount of tuning, and > even then it does not scale linearly. > > Maybe NeilBrown can help? Maybe, but it looks like Neil is not interested. :-( And the more probles is, i plan to modify the entire system structure, and will not be spare drives to testing soon... :-/ Cheers, Janos