From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vladimir Milovanovic Subject: Re: Tiobench results LOWER with more threads Date: Fri, 18 Oct 2002 09:48:31 +0200 Sender: linux-raid-owner@vger.kernel.org Message-ID: <3DAFBCCF.1020000@webmail.co.za> References: <3DABCFE7.9070701@webmail.co.za> <20021017215014.GA7875@unthought.net> <20021018023137.GC18294@peeps.cable.rcn.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: To: Gregory Leblanc Cc: linux-raid List-Id: linux-raid.ids Gregory Leblanc wrote: > > >Interesting. How fast are you getting single-threaded reads from a >single disk? And what are the real specs on the drives (RPM, cache, >SCSI version support (SCSI 3 is a family, not a version)). > I am getting about 12 MB/s for sequential reads single threaded per disk. The disks are 18GB, 7200 rpm, ultra fast/wide scsi disks. I am really not sure about the cache. So what is the consensus now? Let's just stick to RAID 0 - should I see more when going multithreaded or should I not be worried that the transfer rates are dropping off? Note that the rates drop off even if I am only running a 2 disk RAID 0 i.e. my bus is not being maxed out then. Cheers, Vlad.