iostat -xk 5avg-cpu:  %user   %nice %system %iowait  %steal   %idle           0.99    0.00    1.10   11.01    0.00   86.89Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await  svctm  %utilsda               0.00     0.00    0.00    1.50     0.00     6.00     8.00     0.00    1.73   0.40   0.06sdb               0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00sdd               0.00   836.00    0.00   37.50     0.00  3506.00   186.99     0.33    8.75   0.28   1.06sdc               0.00   961.80  137.60   17.80  3221.20  3928.40    92.02     3.36   21.78   6.21  96.53avg-cpu:  %user   %nice %system %iowait  %steal   %idle           0.53    0.00    0.69   14.48    0.00   84.30Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await  svctm  %utilsda               0.00     0.00    0.00    0.70     0.00     2.80     8.00     0.00    1.43   0.86   0.06sdb               0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00sdd               0.00   775.10    0.00   39.70     0.00  3270.40   164.76     0.52   13.13   0.24   0.94sdc               0.00   466.60  103.20  170.60  2480.80  2552.80    36.77    72.97  266.53   3.59  98.42Why it's strange?The sole main operation is moving 40G data from sdc to sdd.So sdd is being written and sdc is being read. Yet sdc, which is being read, has huge writetotal disk activity is around 4MB/s and hard disk is already at full speed capacity. C'mon..... Only 4 MB/s? I know hard disk is not fast. But my hard disk at home does more than 4MB/s.
Strange IOStat xk. Moving a mere 40GB data is too slow. Can anyone explain?
partition;io