From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com (ext-mx11.extmail.prod.ext.phx2.redhat.com [10.5.110.16]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id q29Gepf1005947 for ; Fri, 9 Mar 2012 11:40:51 -0500 Received: from youngberry.canonical.com (youngberry.canonical.com [91.189.89.112]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id q29GeoTl030403 for ; Fri, 9 Mar 2012 11:40:50 -0500 Received: from c-66-30-139-20.hsd1.nh.comcast.net ([66.30.139.20] helo=[192.168.1.128]) by youngberry.canonical.com with esmtpsa (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1S62s5-0001rU-Th for linux-lvm@redhat.com; Fri, 09 Mar 2012 16:40:50 +0000 Message-ID: <4F5A328C.9060309@canonical.com> Date: Fri, 09 Mar 2012 11:40:44 -0500 From: "Peter M. Petrakis" MIME-Version: 1.0 References: In-Reply-To: Content-Transfer-Encoding: 7bit Subject: Re: [linux-lvm] Does a striped LV honor the order of specified PVs Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: linux-lvm@redhat.com On 03/08/2012 01:41 PM, John Anthony wrote: > All: > > This is situation where the number of LUNS - spindles - are many with the > LV striping across all of them. > > To avoid hotspots - the idea is to control the order in which the LUNs are > written to by the LVs. It would appear the specifying the underlying PV - > LUN - order would achieve this goal. Is that correct ? Is there any value > to going through that trouble ? any experiences ? Well striping in general is a "good thing" for performance it's just a matter of how you want to implement it. Yes, LVM can create striped volumes, you could also create a software RAID array [1] to act as your physical volume and achieve the same goal. There's copious material available on the topic of RAID striping. Peter 1. or buy a HW RAID, or a SAN. > > TIA, > > -JAC > > > > > _______________________________________________ > linux-lvm mailing list > linux-lvm@redhat.com > https://www.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/