NFS high CPU usage

Posted by user269836 on Super User See other posts from Super User or by user269836
Published on 2013-11-06T08:09:04Z Indexed on 2013/11/06 9:58 UTC
Read the original article Hit count: 414

Filed under:

linux

|

debian

|

raid

|

nfs

Hello, I have a very strange issue.

I have next server: Intel(R) Xeon(TM) MP CPU 3.16GHz

cat /proc/cpuinfo | grep proce | wc -l
8

free -m
             total       used       free     shared    buffers     cached
Mem:         28203      27606        596          0      10789       9714
-/+ buffers/cache:       7103      21100
Swap:        24695          0      24695

RAID card

*-storage
    description: RAID bus controller
    product: MegaRAID
    vendor: LSI Logic / Symbios Logic
    physical id: 7
    bus info: pci@0000:13:07.0
    logical name: scsi2
    version: 01
    width: 32 bits
    clock: 66MHz
    capabilities: storage pm bus_master cap_list rom
    configuration: driver=megaraid latency=32
    resources: irq:134 memory:d8ff0000-d8ffffff(prefetchable) memory:df600000-df60ffff(prefetchable)

HDD:

10x148Gb SCSI U320 15k - RAID5

/dev/sdb1             807G  674G   93G  88% /storage
/dev/sdb1 /storage ext4 defaults,usrjquota=aquota.user,grpjquota=aquota.group,jqfmt=vfsv0,noatime,nodiratime,noacl,errors=remount-ro 0 1

network cards

ethtool -i eth0
driver: tg3
version: 3.116
firmware-version: 5704-v3.36, ASFIPMIc v2.36
bus-info: 0000:10:02.0

ethtool -i eth1
driver: tg3
version: 3.116
firmware-version: 5704-v3.36, ASFIPMIc v2.36
bus-info: 0000:10:02.0

ifconfig
bond0     Link encap:Ethernet  HWaddr 00:0f:1f:ff:d6:4d
          inet addr:192.168.15.71  Bcast:192.168.15.255  Mask:255.255.255.0
          inet6 addr: fe80::20f:1fff:feff:d64d/64 Scope:Link
          UP BROADCAST RUNNING MASTER MULTICAST  MTU:1500  Metric:1
          RX packets:1062818202 errors:0 dropped:3918 overruns:0 frame:0
          TX packets:1041317321 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:10000
          RX bytes:258867684559 (241.0 GiB)  TX bytes:396569192650 (369.3 GiB)

this server running only nfs-kernel-server

uname -a
Linux nas2-backup 2.6.32-5-amd64 #1 SMP Sun Sep 23 10:07:46 UTC 2012 x86_64 GNU/Linux

Debian 6.

What do I have, once per day or two, LA goes up, it can be reached around LA: 40 but if I do: nfs-kernel-server restart. Every thing is OK. But on the next day or a little bit later, LA goes up again.

Servers are connected to d-link dgs 1016d with 24 GBits ports.

I have tried everything to find out what the problem is. Why it's happening, but still I can not resolve this issue. Any ideas on what is happening here?

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