From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-ID: <3AEEAEAA.93304CBB@loria.fr> Date: Tue, 01 May 2001 14:40:10 +0200 From: Dominique LARCHEY-WENDLING MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [linux-lvm] LVM & high system load 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" To: linux-lvm@sistina.com Hi, I am newbie to LVM. I am experiencing high cpu load (system time > 90%) and relatively poor IO perf. (my cpu is only PII 333) on LVM volumes. I have tested reiserfs and ext2fs and I only get about 2.5Mb/s with 100% CPU load, mostly system time. Due to some failures of vgscan (no volume found) and vgchange (core dumps,) I had to upgrade my 2.4.3 kernel to LVM beta7 and also the system tools. Now it seems that theses tools work but I still have very high loads, much higher than what I would have on a fs lying on a partition. My logical volumes are not stripped. Is this a known issue ? Thanks in advance, DL -- Dominique Larchey LORIA, Nancy, France Tel. (Work) +33 (0) 3 83 59 20 13 ---------------------------- [root@charlie temp]# /usr/sbin/vgdisplay mmedia --- Volume group --- VG Name mmedia VG Access read/write VG Status available/resizable VG # 0 MAX LV 256 Cur LV 3 Open LV 3 MAX LV Size 255.99 GB Max PV 256 Cur PV 3 Act PV 3 VG Size 28.49 GB PE Size 4 MB Total PE 7294 Alloc PE / Size 5066 / 19.79 GB Free PE / Size 2228 / 8.7 GB VG UUID dF3isK-xdlk-YF7u-FwxQ-KnPQ-jgG6-qjt73X [root@charlie temp]# /usr/sbin/pvdisplay /dev/hda1 /dev/hda5 /dev/hda6 --- Physical volume --- PV Name /dev/hda1 VG Name mmedia PV Size 9.77 GB / NOT usable 1.37 MB [LVM: 130 KB] PV# 1 PV Status available Allocatable yes (but full) Cur LV 1 PE Size (KByte) 4096 Total PE 2500 Free PE 0 Allocated PE 2500 PV UUID 3aeAAl-88en-VZxJ-84gE-Uaxu-AWZm-zoA3jC --- Physical volume --- PV Name /dev/hda5 VG Name mmedia PV Size 9.77 GB / NOT usable 1.37 MB [LVM: 130 KB] PV# 2 PV Status available Allocatable yes (but full) Cur LV 3 PE Size (KByte) 4096 Total PE 2500 Free PE 0 Allocated PE 2500 PV UUID lUiRFu-JEhC-d5JS-Jycy-VFa8-2o2y-6I9V9S --- Physical volume --- PV Name /dev/hda6 VG Name mmedia PV Size 8.96 GB / NOT usable 1.73 MB [LVM: 129 KB] PV# 3 PV Status available Allocatable yes Cur LV 0 PE Size (KByte) 4096 Total PE 2294 Free PE 2228 Allocated PE 66 PV UUID GOf2OV-khJd-w1cJ-AEk3-RvyA-Wdly-p5OuWd [root@charlie temp]# /usr/sbin/lvdisplay /dev/mmedia/music /dev/mmedia/temp /dev/mmedia/test --- Logical volume --- LV Name /dev/mmedia/music VG Name mmedia LV Write Access read/write LV Status available LV # 2 # open 1 LV Size 9 GB Current LE 2304 Allocated LE 2304 Allocation next free Read ahead sectors 120 Block device 58:1 --- Logical volume --- LV Name /dev/mmedia/temp VG Name mmedia LV Write Access read/write LV Status available LV # 1 # open 1 LV Size 9.79 GB Current LE 2506 Allocated LE 2506 Allocation next free Read ahead sectors 120 Block device 58:0 --- Logical volume --- LV Name /dev/mmedia/test VG Name mmedia LV Write Access read/write LV Status available LV # 3 # open 1 LV Size 1 GB Current LE 256 Allocated LE 256 Allocation next free Read ahead sectors 120 Block device 58:2