Disk IO performance tuning of oracle 10g 64bit  on rhel5 64bit

Hi Friends,
I am very new on oracle database tuning part.
I am facing some issues on the oracle disk io data transfer rate on rhel5.
Please help me. Details of issue is below.
I am using the iscsi san storage to install the database. My san storage is having more than 100Mbps transfer speed.
When oracle backup is running the data transfer rate is spikes upto 100Mbps, but when oracle normal transaction is happening it is not going more than 30Mbps.
My data base is an hybrid one and more read transaction is happening. Server is running with 4 cpus and 16GB of ram.
Here i am providing the iostat command output. Please have a look into this and help me to resolve.
[root@hostname ~]# iostat -x 1 5
Linux 2.6.18-128.el5 (hostname)    
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          24.94    0.00    4.15   31.94    0.00   38.96
Device:         rrqm/s   wrqm/s   r/s   w/s   rsec/s   wsec/s avgrq-sz avgqu-sz   await  svctm  %util
sda               7.61    10.42  4.28  5.28   345.38   125.59    49.26     0.12   12.91   3.18   3.04
sda1              0.30     0.00  0.03  0.00     0.65     0.00    22.59     0.00    3.76   2.66   0.01
sda2              0.22     0.00  0.01  0.00     0.23     0.00    18.78     0.00    4.05   3.54   0.00
sda3              5.25     8.26  3.58  2.47   310.67    85.87    65.54     0.09   15.09   3.37   2.04
sda4              0.00     0.00  0.00  0.00     0.00     0.00     1.83     0.00    0.33   0.33   0.00
sda5              0.83     1.95  0.55  2.70    31.62    37.24    21.17     0.03    8.88   3.49   1.13
sda6              0.68     0.07  0.06  0.04     1.11     0.85    19.74     0.00   13.91   9.05   0.09
sda7              0.33     0.14  0.04  0.07     0.90     1.63    24.17     0.00   15.73  11.13   0.12
sdb               0.06     0.00  0.03  0.00     0.75     0.00    25.57     0.00    1.64   1.48   0.00
sdb1              0.04     0.00  0.01  0.00     0.45     0.00    34.90     0.00    3.13   2.85   0.00
sdc               5.86     0.16 45.05  2.74  7805.28   129.85   166.04     2.57   53.82   9.12  43.58
sdc1              5.79     0.16 45.02  2.74  7804.99   129.85   166.12     2.57   53.85   9.12  43.57
sdd               5.85     0.17 44.45  2.68  7767.34   133.80   167.65     2.68   56.95   9.43  44.43
sdd1              5.78     0.17 44.42  2.68  7767.06   133.80   167.74     2.68   56.98   9.43  44.43
sde               5.89     0.16 44.86  2.37  7774.84   122.75   167.23     2.24   47.51   8.96  42.30
sde1              5.82     0.16 44.83  2.37  7774.55   122.75   167.31     2.24   47.54   8.96  42.29
sdf               5.91     0.16 63.70  2.69  8053.71   133.15   123.32     2.98   44.89   7.59  50.40
sdf1              5.84     0.16 63.67  2.69  8053.43   133.15   123.36     2.98   44.91   7.59  50.39
sdg               0.19     0.11  0.07  0.61     2.54   131.30   199.27     0.04   65.76  28.52   1.92
sdg1              0.12     0.11  0.04  0.61     2.25   131.30   206.81     0.04   68.26  29.56   1.91
sdh               4.43     2.29  0.99  1.36   199.10    29.19    97.03     0.05   20.92   5.13   1.21
sdh1              4.43     2.29  0.98  1.36   198.95    29.19    97.49     0.05   21.01   5.14   1.20
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          13.72    0.00    2.49   75.31    0.00    8.48
Device:         rrqm/s   wrqm/s   r/s   w/s   rsec/s   wsec/s avgrq-sz avgqu-sz   await  svctm  %util
sda               0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sda1              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sda2              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sda3              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sda4              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sda5              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sda6              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sda7              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sdb               0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sdb1              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sdc              18.00     0.00 54.00  2.00 25984.00   160.00   466.86     8.96   94.18  17.89 100.20
sdc1             18.00     0.00 54.00  2.00 25984.00   160.00   466.86     8.96   94.18  17.89 100.20
sdd              18.00     0.00 79.00  2.00 40240.00    32.00   497.19     8.61  118.93  12.04  *97.50*
sdd1             18.00     0.00 79.00  2.00 40240.00    32.00   497.19     8.61  118.93  12.04  *97.50*
sde              19.00     0.00 44.00  8.00 26656.00   187.00   516.21     9.34  119.81  19.27 *100.20*
sde1             19.00     0.00 44.00  8.00 26656.00   187.00   516.21     9.34  119.81  19.27 *100.20*
sdf              26.00     0.00 76.00  6.00 35600.00    59.00   434.87     3.23   40.76  10.52  86.30
sdf1             26.00     0.00 76.00  6.00 35600.00    59.00   434.87     3.23   40.76  10.52  86.30
sdg               0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sdg1              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sdh               0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sdh1              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          18.64    0.00    5.29   49.87    0.00   26.20
Device:         rrqm/s   wrqm/s   r/s   w/s   rsec/s   wsec/s avgrq-sz avgqu-sz   await  svctm  %util
sda               0.00    14.00  0.00  3.00     0.00   136.00    45.33     0.01    1.67   1.67   0.50
sda1              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sda2              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sda3              0.00    14.00  0.00  3.00     0.00   136.00    45.33     0.01    1.67   1.67   0.50
sda4              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sda5              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sda6              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sda7              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sdb               0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sdb1              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sdc              44.00     0.00 99.00  1.00 58368.00     8.00   583.76    12.03  154.83   9.66  96.60
sdc1             44.00     0.00 99.00  1.00 58368.00     8.00   583.76    12.03  154.83   9.66  96.60
sdd              44.00     0.00 103.00  0.00 50672.00     0.00   491.96    10.07   82.47   8.37  86.20
sdd1             44.00     0.00 103.00  0.00 50672.00     0.00   491.96    10.07   82.47   8.37  86.20
sde              45.00     0.00 110.00  5.00 58176.00   126.00   506.97    13.01  113.47   8.02  92.20
sde1             45.00     0.00 110.00  5.00 58176.00   126.00   506.97    13.01  113.47   8.02  92.20
sdf              40.00     0.00 122.00  5.00 52944.00   126.00   417.87     9.74   63.94   6.52  82.80
sdf1             40.00     0.00 122.00  5.00 52944.00   126.00   417.87     9.74   63.94   6.52  82.80
sdg               0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.01    0.00   0.00   0.90
sdg1              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.01    0.00   0.00   0.90
sdh               0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sdh1              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           7.48    0.00    2.49   *61.60*    0.00   28.43
Device:         rrqm/s   wrqm/s   r/s   w/s   rsec/s   wsec/s avgrq-sz avgqu-sz   await  svctm  %util
sda               0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sda1              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sda2              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sda3              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sda4              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sda5              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sda6              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sda7              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sdb               0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sdb1              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sdc              13.86     0.00 38.61  0.99 19611.88    11.88   495.50     3.35   79.53  25.03  99.11
sdc1             13.86     0.00 38.61  0.99 19611.88    11.88   495.50     3.35   79.53  25.03  99.11
sdd              15.84     0.00 40.59  0.99 17758.42    31.68   427.81    10.93  122.36  23.26  96.73
sdd1             15.84     0.00 40.59  0.99 17758.42    31.68   427.81    10.93  122.36  23.26  96.73
sde              12.87     0.00 46.53  1.98 22035.64    70.30   455.65    13.19  275.96  20.43  99.11
sde1             12.87     0.00 46.53  1.98 22035.64    70.30   455.65    13.19  275.96  20.43  99.11
sdf              13.86     0.00 39.60  2.97 17584.16   101.98   415.42     6.83   81.19  22.21  94.55
sdf1             13.86     0.00 39.60  2.97 17584.16   101.98   415.42     6.83   81.19  22.21  94.55
sdg               0.00     0.00  0.00  0.99     0.00     7.92     8.00     0.21  226.00 217.00  21.49
sdg1              0.00     0.00  0.00  0.99     0.00     7.92     8.00     0.21  226.00 217.00  21.49
sdh               0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sdh1              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          24.69    0.00    8.98   48.38    0.00   17.96
Device:         rrqm/s   wrqm/s   r/s   w/s   rsec/s   wsec/s avgrq-sz avgqu-sz   await  svctm  %util
sda               0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sda1              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sda2              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sda3              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sda4              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sda5              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sda6              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sda7              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sdb               0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sdb1              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sdc              25.00     0.00 61.00  4.00 36304.00   120.00   560.37     9.58  156.23  14.78  96.10
sdc1             25.00     0.00 61.00  4.00 36304.00   120.00   560.37     9.58  156.23  14.78  96.10
sdd              23.00     0.00 82.00  1.00 34832.00    32.00   420.05     7.61  163.49  11.27  93.50
sdd1             23.00     0.00 82.00  1.00 34832.00    32.00   420.05     7.61  163.49  11.27  93.50
sde              27.00     0.00 62.00  0.00 32864.00     0.00   530.06     9.41  149.56  16.15 100.10
sde1             27.00     0.00 62.00  0.00 32864.00     0.00   530.06     9.41  149.56  16.15 100.10
sdf              17.00     0.00 101.00  4.00 42656.00   132.00   407.50     4.18   88.24   6.72  70.60
sdf1             17.00     0.00 101.00  4.00 42656.00   132.00   407.50     4.18   88.24   6.72  70.60
sdg               0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sdg1              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sdh               0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
sdh1              0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00Regards,
Nayagan
Edited by: nayagan on Jan 27, 2010 12:23 PM
Edited by: nayagan on Jan 27, 2010 2:04 PM

Two points:
1. I can not read what you posted because you did not read the FAQ (upper right) and put tags around the listing so it would retain its formatting.
2. Even if I could read them I wouldn't as they are not necessarily relevant. What I would want to see is what query you are issuing that you think should be maxing out your disk subsystem and giving you the performance you expect. Single block reads read single blocks. Post the DML and the corresponding explain plan report generated using DBMS_XPLAN.DISPLAY or AUTOTRACE. Also the result of this statement in SQL*Plus.show arraysize
Because this is precisely what is going to be brought back with each round trip between the client (SQL*Plus) and the server.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

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