From owner-freebsd-performance@FreeBSD.ORG Thu Aug 13 18:05:56 2009 Return-Path: Delivered-To: freebsd-performance@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id E1552106566C for ; Thu, 13 Aug 2009 18:05:56 +0000 (UTC) (envelope-from lambert@lambertfam.org) Received: from sysmon.tcworks.net (sysmon.tcworks.net [65.66.76.4]) by mx1.freebsd.org (Postfix) with ESMTP id AD7748FC41 for ; Thu, 13 Aug 2009 18:05:56 +0000 (UTC) Received: from sysmon.tcworks.net (localhost [127.0.0.1]) by sysmon.tcworks.net (8.13.1/8.13.1) with ESMTP id n7DHbRd2064325 for ; Thu, 13 Aug 2009 12:37:27 -0500 (CDT) (envelope-from lambert@lambertfam.org) Received: (from lambert@localhost) by sysmon.tcworks.net (8.13.1/8.13.1/Submit) id n7DHbRph064324 for freebsd-performance@freebsd.org; Thu, 13 Aug 2009 12:37:27 -0500 (CDT) (envelope-from lambert@lambertfam.org) X-Authentication-Warning: sysmon.tcworks.net: lambert set sender to lambert@lambertfam.org using -f Date: Thu, 13 Aug 2009 12:37:27 -0500 From: Scott Lambert To: FreeBSD Performance Message-ID: <20090813173727.GF91291@sysmon.tcworks.net> Mail-Followup-To: FreeBSD Performance References: <4A83A61E.6010009@bulinfo.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4A83A61E.6010009@bulinfo.net> User-Agent: Mutt/1.4.2.2i Subject: Re: Very slow I/O performance on HP BL465c X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 13 Aug 2009 18:05:57 -0000 > Nathan Le Nevez wrote: > > I?m fairly certain this is a hardware problem ? swapping the disks from > > a known working install on another blade produced the same lousy > > performance. > > >>>> Hi, > >>>> > >>>> I'm running 7.2-p3 on 2x HP BL465c blade servers, one of which > >>>> performs very poorly. Both have the same RAID controller and 2 x > >>>> 146GB 10k SAS disks configured in RAID-1. Both controllers have > >>>> write-cache enabled. Both servers are running the same BIOS and > >>>> firmware versions. Neither servers are running any services other > >>>> than sshd. > >>>> > >>>> Blade with good performance (2 x Opteron 2218, 8GB RAM): > >>>> > >>>> Blade with bad performance (2 x Opteron 2352, 16GB RAM): > >>>> > >>>> # dbench -t 10 1 2 3 4 > >>>> blade1 183.456 MB/sec 236.86 MB/sec 299.28 MB/sec 192.675 MB/sec > >>>> blade2 6.97931 MB/sec 9.42293 MB/sec 10.2482 MB/sec 12.407 MB/sec Sorry, I deleted the start of this thread. I figured someone else would suggest pulling half the RAM in the slow server. That seems to be the biggest difference in configuration, other than CPU model. I don't know that it could cause this problem, but it would seem to be easy enough to test if they are not in production, yet. Just grasping at staws here... -- Scott Lambert KC5MLE Unix SysAdmin lambert@lambertfam.org