From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Raz Ben-Yehuda" Subject: RE: Intel X25-M MLC SSD benchmarks Date: Fri, 12 Dec 2008 14:21:48 +0200 Message-ID: <83CA05F64804AF43B8F733C4ABDFAA51022D04DB@mail1.bitband.com> References: <311601c90812111927t54ed6a54oac3154dba30f737d@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT Return-path: Received: from fw.bitband.com ([213.8.50.174]:52859 "EHLO mail.bitband.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755589AbYLLMVv convert rfc822-to-8bit (ORCPT ); Fri, 12 Dec 2008 07:21:51 -0500 Content-class: urn:content-classes:message In-Reply-To: <311601c90812111927t54ed6a54oac3154dba30f737d@mail.gmail.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: "Eric D. Mudama" Cc: linux-ide@vger.kernel.org, linux-scsi@vger.kernel.org -----Original Message----- From: Eric D. Mudama [mailto:edmudama@gmail.com] Sent: Friday, December 12, 2008 5:28 AM To: Raz Ben-Yehuda Cc: Matthew Wilcox; linux-ide@vger.kernel.org; linux-scsi@vger.kernel.org Subject: Re: Intel X25-M MLC SSD benchmarks On 12/10/08, Raz Ben-Yehuda wrote: > All gave same results for most dd writes commands. > dd if=/dev/zero of=/dev/sda bs=1M count=1000 oflag=direct , and many > other variants such erase block size ( 128K ) , several erase block size > and so on. Kernel is 2.6.18-8.el5. > I used all on a supermicro 1025W-UR. Disks have a SAS interface, 80GB. > Also, I would like to note, I have 8 disks in array, while each one > perform READS 250 MB/s, together I degrade to 200 MB/s each. As for > writes I always reach 20 MB/s at best, from a single disk or 20x8 in > array. >>Out of curiosity, is write cache enabled or disabled on these devices? Does not matter. In both cases same low numbers. Write cache depends on the controller defaults ( Adpaptec AHCI, Intel provides different default).