Hi,
You can find below the spec of my server:
cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 37
model name : AMD Opteron(tm) Processor 248
stepping : 1
cpu MHz : 2200.034
cache size : 1024 KB
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt lm 3dnowext 3dnow pni lahf_lm
bogomips : 4400.06
TLB size : 1024 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: ts fid vid ttp
processor : 1
vendor_id : AuthenticAMD
cpu family : 15
model : 37
model name : AMD Opteron(tm) Processor 248
stepping : 1
cpu MHz : 2200.034
cache size : 1024 KB
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt lm 3dnowext 3dnow pni lahf_lm
bogomips : 4399.42
TLB size : 1024 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: ts fid vid ttp
free
total used free shared buffers cached
Mem: 2059236 2049896 9340 0 9800 1874828
-/+ buffers/cache: 165268 1893968
Swap: 4095992 112 4095880
Linux 1-NFS.domain.com 2.6.18-164.9.1.el5 #1 SMP Tue Dec 15 20:57:57 EST 2009 x86_64 x86_64 x86_64 GNU/Linux
--- Physical volume ---
PV Name /dev/sdc1
VG Name vgspace
PV Size 4.55 TB / not usable 1.97 MB
Allocatable yes
PE Size (KByte) 4096
Total PE 1192067
Free PE 795267
Allocated PE 396800
--- Physical volume ---
PV Name /dev/sdd1
VG Name vgspace
PV Size 4.55 TB / not usable 1.97 MB
Allocatable yes
PE Size (KByte) 4096
Total PE 1192067
Free PE 808067
Allocated PE 384000
I need ext4 for file bigger than 2TB.
/dev/mapper/vgspace-vol1 on /vol/vol1 type ext4 (rw,noatime)
/dev/mapper/vgspace-vol2 on /vol/vol2 type ext4 (rw,noatime)
# tune2fs -l /dev/mapper/vgspace-vol1
tune2fs 1.39 (29-May-2006)
tune2fs: Filesystem has unsupported feature(s) while trying to open /dev/mapper/vgspace-vol1
Couldn't find valid filesystem superblock.
# tune2fs -l /dev/mapper/vgspace-vol2
tune2fs 1.39 (29-May-2006)
tune2fs: Filesystem has unsupported feature(s) while trying to open /dev/mapper/vgspace-vol2
Couldn't find valid filesystem superblock.
export nfs :
/vol/vol1 192.168.*.0/255.255.255.0(async,no_subtree_check,rw,no_root_squash)
/vol/vol2 192.168.*.0/255.255.255.0(async,no_subtree_check,rw,no_root_squash)
Best regards
Fabien FAYE
----- Original Message -----
From: "Jim Perrin" <jperrin at gmail.com>
To: "CentOS mailing list" <centos at centos.org>
Sent: Monday, January 25, 2010 2:27:41 PM
Subject: Re: [CentOS] Too much cpu wait on nfs server when we need to read data on it
On Mon, Jan 25, 2010 at 8:39 AM, fabien faye <fabien at faye.eu> wrote:
> Hi,
>
> I have a big server with 24 Disk on 2 3ware card.
Define 'big'. You're not giving much in terms of memory or cpu specs.
> When i write data on my nfs server everything is fine but when i want to read data i have a lot of cpu wait.
Okay. Have you looked at any performance tuning or elevator/scheduler
adjustments? File system tuning? What have you tried on your own so
far to debug this?
> about the file system, i use ext4 on LVM partition.
Why? Is there a performance reason for you to use ext4 vs ext3?
> Do you have any idea about that.
Not based on the little information you've provided. It would help for
you to supply more detail, and the things you've already looked at.
--
During times of universal deceit, telling the truth becomes a revolutionary act.
George Orwell
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