From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stan Hoeppner Subject: Re: advice to low cost hardware raid (with mdadm) Date: Thu, 16 Sep 2010 23:38:59 -0500 Message-ID: <4C92F0E3.5060207@hardwarefreak.com> References: <00c6ed0254381567aff38d7a95d200c5.squirrel@fuckaround.org> <4C912F5D.5040305@hardwarefreak.com> <4C929D19.80001@ziu.info> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4C929D19.80001@ziu.info> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids Michal Soltys put forth on 9/16/2010 5:41 PM: > On 10-09-16 00:03, Pol Hallen wrote: >> >>> additionally, in the event >>> of a disk failure, rebuilding a 6x1TB RAID5/6 array will take forever >>> and a day. >> >> a nightmare... >> >> very thanks for your reasoning.. I don't have enought experience about >> raid and friends! >> >> Pol > > One remark - write intent bitmaps will make it perfectly fine (orders of > magnitude faster). I'm not sure how the feature looks from performance > point of view these days though. My "forever and a day" RAID6 build/rebuild comment may have been taken out of context. The original post was inquiring about running a qty 6 SATA disk md RAID6 array on a standard 132 MB/s PCI bus, using three 2 port PCI SATA cards on the single PCI bus. My comments were focused on the PCI bottleneck in such a setup causing dreadful array performance. -- Stan