From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx3.redhat.com (mx3.redhat.com [172.16.48.32]) by int-mx1.corp.redhat.com (8.13.1/8.13.1) with ESMTP id n6GL8DDH013780 for ; Thu, 16 Jul 2009 17:08:13 -0400 Received: from mail-bw0-f216.google.com (mail-bw0-f216.google.com [209.85.218.216]) by mx3.redhat.com (8.13.8/8.13.8) with ESMTP id n6GL7x5l012456 for ; Thu, 16 Jul 2009 17:07:59 -0400 Received: by bwz12 with SMTP id 12so357244bwz.3 for ; Thu, 16 Jul 2009 14:07:59 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <5de034af0907121156s491df9cei264569333ea6a787@mail.gmail.com> References: <5de034af0907121156s491df9cei264569333ea6a787@mail.gmail.com> From: Diego Jacobi Date: Thu, 16 Jul 2009 23:07:39 +0200 Message-ID: <5de034af0907161407p5a3315f9r96104f4dd035de76@mail.gmail.com> Content-Transfer-Encoding: 8bit Subject: [linux-lvm] Re: Parallel mirroring 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="utf-8" To: linux-lvm@redhat.com Hi. Sry for retry but the lvm list is my last resource. Does Linux-LVM have Parallel scheduler mode for mirroring at all? If yes, how do you set it up, or check if it is enabled? Thanks. Diego 2009/7/12 Diego Jacobi : > Hello. > > I have succesfully configured Mirroring between 2 disks in linux for 2 > logical volumes, and on other without mirroring. > But i can not find any evidence showing that it is reading in parallel > scheduler mode. > I have read HP docs about HP-UX, but it talks about command line > options which arent in the linux side. > > The "-d p" in HP-UX would be what i need now for linux. Also lvdisplay > doesnt show anything about it, more than the number of mirrors. > > > This are my tests: > > sda1 = /boot in disk 1, no lvm > sdb1 = /boot in disk 2, no lvm > data/data = lvm without mirroring > data/root = lvm with mirroring > > > linux-8mmd:~ # hdparm -t /dev/sda1 > /dev/sda1: > �Timing buffered disk reads: �262 MB in �3.02 seconds = �86.83 MB/sec > > linux-8mmd:~ # hdparm -t /dev/sdb1 > /dev/sdb1: > �Timing buffered disk reads: �174 MB in �3.03 seconds = �57.36 MB/sec > > linux-8mmd:~ # hdparm -t /dev/data/data > /dev/data/data: > �Timing buffered disk reads: �272 MB in �3.02 seconds = �90.02 MB/sec > > linux-8mmd:~ # hdparm -t /dev/data/root > /dev/data/root: > �Timing buffered disk reads: �278 MB in �3.02 seconds = �92.16 MB/sec > > > > As you can see, the read speed are mostly the same. This could mean a > secuenced scheduler. > > And this is my system setup: > > lvm> version > �LVM version: � � 2.02.39 (2008-06-27) > �Library version: 1.02.27 (2008-06-25) > �Driver version: �4.14.0 > > linux-8mmd:~ # pvs > �PV � � � � VG � Fmt �Attr PSize � PFree > �/dev/sda3 �data lvm2 a- � 537.11G 395.12G > �/dev/sda5 �data lvm2 a- � 996.00M 988.00M � � � � <--- Note 1 Gb, for log > �/dev/sdb3 �data lvm2 a- � 138.99G 118.99G > > linux-8mmd:~ # lvs -a -o +devices > �LV � � � � � � �VG � Attr � LSize � Origin Snap% �Move Log > Copy% �Convert Devices > �data � � � � � �data -wi-ao 121.50G > � � � � � /dev/sda3(125) > �home � � � � � �data mwi-ao �10.00G � � � � � � � � � �home_mlog > 100.00 � � � � home_mimage_0(0),home_mimage_1(0) > �[home_mimage_0] data iwi-ao �10.00G > � � � � � /dev/sda3(33788) > �[home_mimage_1] data iwi-ao �10.00G > � � � � � /dev/sdb3(2560) > �[home_mlog] � � data lwi-ao � 4.00M > � � � � � /dev/sda5(1) > �root � � � � � �data mwi-ao �10.00G � � � � � � � � � �root_mlog > 100.00 � � � � root_mimage_0(0),root_mimage_1(0) > �[root_mimage_0] data iwi-ao �10.00G > � � � � � /dev/sda3(31228) > �[root_mimage_1] data iwi-ao �10.00G > � � � � � /dev/sdb3(0) > �[root_mlog] � � data lwi-ao � 4.00M > � � � � � /dev/sda5(0) > �test � � � � � �data -wi-a- 500.00M > � � � � � /dev/sda3(0) >