From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com (mx1.redhat.com [172.16.48.31]) by int-mx1.corp.redhat.com (8.13.1/8.13.1) with ESMTP id n6CIub9D021758 for ; Sun, 12 Jul 2009 14:56:37 -0400 Received: from mail-bw0-f219.google.com (mail-bw0-f219.google.com [209.85.218.219]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id n6CIuNEq018615 for ; Sun, 12 Jul 2009 14:56:23 -0400 Received: by bwz19 with SMTP id 19so87709bwz.3 for ; Sun, 12 Jul 2009 11:56:23 -0700 (PDT) MIME-Version: 1.0 From: Diego Jacobi Date: Sun, 12 Jul 2009 20:56:03 +0200 Message-ID: <5de034af0907121156s491df9cei264569333ea6a787@mail.gmail.com> Content-Transfer-Encoding: 7bit Subject: [linux-lvm] 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="us-ascii" To: linux-lvm@redhat.com 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)