[linux-lvm] LVM & high system load
Dominique LARCHEY-WENDLING
Dominique.Larchey-Wendling at loria.fr
Tue May 1 12:40:10 UTC 2001
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 at 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 at 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 at 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
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