Hi,
I have a dedicated NFS server running Raid5 disks and recently
observed a sudden increase in load average and some abnormal behavior
(e.g. command "df -h" halt without returning).
I have checked the Dell OpenManage and showing hardware is okay, the
load average used to be around 3 to 4 before.
Some info might be useful:
>> top
top - 13:17:53 up 382 days, 23:44, 6 users, load average: 20.53, 20.21, 18.93
Tasks: 286 total, 1 running, 285 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.1% us, 1.1% sy, 0.0% ni, 68.4% id, 29.9% wa, 0.0% hi, 0.5% si
Mem: 4045256k total, 4028028k used, 17228k free, 437428k buffers
Swap: 9775512k total, 160k used, 9775352k free, 2814332k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2049 root 15 0 0 0 0 S 1 0.0 861:21.26 kjournald
26094 root 15 0 0 0 0 S 0 0.0 85:02.82 nfsd
26106 root 15 0 0 0 0 S 0 0.0 83:49.86 nfsd
26110 root 15 0 0 0 0 S 0 0.0 84:33.23 nfsd
26124 root 15 0 0 0 0 S 0 0.0 84:37.47 nfsd
2839 root 16 0 6280 1172 780 R 0 0.0 0:00.02 top
..
>> iostat
avg-cpu: %user %nice %sys %iowait %idle
0.06 0.00 1.34 21.60 77.00
Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
sda 114.89 4.33 18.05 143391021 597126208
sda1 1.07 0.69 8.26 22771290 273100496
sda2 0.00 0.00 0.00 2 0
sda5 0.00 0.00 0.00 1010 408
sda6 110.49 3.63 9.79 119979495 323992464
dm-0 0.58 2.91 3.22 96295602 106444120
dm-1 0.55 0.60 4.31 19996266 142435600
dm-2 0.02 0.08 0.18 2673626 5953184
dm-3 109.53 1.52 2.09 50389354 69192400
>> df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 9.7G 1.6G 7.6G 18% /
none 2.0G 0 2.0G 0% /dev/shm
/dev/mapper/lvm01-lvm01_usr
20G 1.5G 18G 8% /usr
/dev/mapper/lvm01-lvm01_var
9.9G 327M 9.1G 4% /var
/dev/mapper/lvm01-lvm01_home
9.9G 56M 9.3G 1% /home
/dev/mapper/lvm01-lvm01_data0
492G 285G 182G 62% /data0
# !!! == The command stopped at here without returning === !!!
Any idea?
Howard
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