From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Fri, 1 Jun 2001 14:08:05 +0200 From: "Heinz J. Mauelshagen" Subject: Re: [linux-lvm] How do I find out if my logic volume is striped or not? Message-ID: <20010601140805.B9156@sistina.com> References: <20010530191028.9476.MRLIST@activestate.com> <20010531143457.A4310@sistina.com> <20010531100027.EC5A.MRLIST@activestate.com> Mime-Version: 1.0 In-Reply-To: <20010531100027.EC5A.MRLIST@activestate.com>; from mrlist@ActiveState.com on Thu, May 31, 2001 at 10:08:06AM -0700 Sender: linux-lvm-admin@sistina.com Errors-To: linux-lvm-admin@sistina.com Reply-To: linux-lvm@sistina.com List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: List-Id: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-lvm@sistina.com On Thu, May 31, 2001 at 10:08:06AM -0700, Eric Wang wrote: > I am trying to achive the best performance > here is my situation Eric, in your IDE case you could gain performance setting up a striped LV on hda *or* hdb and hdc. IDE devices sitting on the same adaptor suffer from io constraints and therefore don't give you parallel thrughput. > > #vgdisplay -v > --- Volume group --- > VG Name TITAN > VG Access read/write > VG Status available/resizable > VG # 0 > MAX LV 256 > Cur LV 1 > Open LV 0 > MAX LV Size 255.99 GB > Max PV 256 > Cur PV 3 > Act PV 3 > VG Size 98.65 GB > PE Size 4 MB > Total PE 25255 > Alloc PE / Size 19482 / 76.1 GB > Free PE / Size 5773 / 22.55 GB > VG UUID c2I7Km-QuZy-O3GK-nUXL-WtAC-VHRO-r75ivY > > --- Logical volume --- > LV Name /dev/TITAN/home > VG Name TITAN > LV Write Access read/write > LV Status available > LV # 1 > # open 0 > LV Size 76.1 GB > Current LE 19482 > Allocated LE 19482 > Stripes 2 > Stripe size (KByte) 4 > Allocation next free > Read ahead sectors 120 > Block device 58:0 > > > --- Physical volumes --- > PV Name (#) /dev/hda9 (3) > PV Status available / allocatable > Total PE / Free PE 5649 / 5649 > > PV Name (#) /dev/hdb1 (1) > PV Status available / allocatable > Total PE / Free PE 9803 / 63 > > PV Name (#) /dev/hdc1 (2) > PV Status available / allocatable > Total PE / Free PE 9803 / 63 > > I am trying to create stripped lv here, how I am going to do that? You already created one; see the lines above saying "Stripes 2" and "Stripe size (KByte) 4". > > anyway an odd problem is after create a stripped lv then vgextent the vg > with /dev/hda9, but I can't lvextent the lv > # lvextend -L+20G /dev/TITAN/home > lvextend -- extending logical volume "/dev/TITAN/home" to 96.1 GB > lvextend -- not enough free/allocatable physical extents to extend logical volume "/dev/TITAN/home" > > what was the problem? That's a constraint of the LVM which will disapear in a post 1.0 release. If you want to extend on multiple PVs you need to go with a linear LV. Regards, Heinz -- The LVM Guy -- > > > On Thu, 31 May 2001 14:34:57 +0200 > "Heinz J. Mauelshagen" wrote: > > > > > Eric, > > > > lvdisplay shows lines beginning with "Stripes" and "Stripe size (KByte)" > > in case you use it on a striped LV and /proc/lvm/global displays > > information as well. > > > > On Wed, May 30, 2001 at 07:11:36PM -0700, Eric Wang wrote: > > > Hi all, > > > > > > How do I find out if my logic volume is striped or not? > > > lvdisplay seems not produce this information. > > > > > > Thanks > > > _______________________________________________ > > > linux-lvm mailing list > > > linux-lvm@sistina.com > > > http://lists.sistina.com/mailman/listinfo/linux-lvm > > > read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html > > > > -- > > > > Regards, > > Heinz -- The LVM Guy -- > > > > *** Software bugs are stupid. > > Nevertheless it needs not so stupid people to solve them *** > > > > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- > > > > Heinz Mauelshagen Sistina Software Inc. > > Senior Consultant/Developer Am Sonnenhang 11 > > 56242 Marienrachdorf > > Germany > > Mauelshagen@Sistina.com +49 2626 141200 > > FAX 924446 > > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- > > _______________________________________________ > > linux-lvm mailing list > > linux-lvm@sistina.com > > http://lists.sistina.com/mailman/listinfo/linux-lvm > > read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html > > > _______________________________________________ > linux-lvm mailing list > linux-lvm@sistina.com > http://lists.sistina.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html *** Software bugs are stupid. Nevertheless it needs not so stupid people to solve them *** =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Heinz Mauelshagen Sistina Software Inc. Senior Consultant/Developer Am Sonnenhang 11 56242 Marienrachdorf Germany Mauelshagen@Sistina.com +49 2626 141200 FAX 924446 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-