From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stan Hoeppner Subject: Re: standard performance (write speed 20Mb/s) Date: Wed, 27 Jul 2011 05:22:01 -0500 Message-ID: <4E2FE6C9.4070604@hardwarefreak.com> References: <201107162140.58883.raid1@fuckaround.org> <4E226464.2030200@hardwarefreak.com> <4E22D167.2010905@anonymous.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Simon Matthews Cc: John Robinson , Pol Hallen , linux-raid@vger.kernel.org List-Id: linux-raid.ids On 7/27/2011 12:42 AM, Simon Matthews wrote: > On Sun, Jul 17, 2011 at 5:11 AM, John Robinson > wrote: > >> Pretty poor. CentOS 5, Intel ICH10, md RAID 6 over 5 7200rpm 1TB drives, >> then LVM, then ext3: >> # dd if=/dev/zero of=test bs=4096 count=262144 >> 262144+0 records in >> 262144+0 records out >> 1073741824 bytes (1.1 GB) copied, 2.5253 seconds, 425 MB/s > > What hard drive offers a sustained data rate of 425 MB/s or even half that? 425 MB/s / 3 spindles = 142 MB/s per spindle That's not poor, it's excellent. Which drives are these? WD Black, Seagate, Hitachi? -- Stan