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Linux I/O / performance issues

edited Oct 23, 2015 8:12AM in Linux Operating System (MOSC) Question

Hello folks

We have a Linux server in production running oracle database 10.2.0.4

Red Hat Enterprise Linux Server release 5.7 (Tikanga)

2.6.18-274.el5

Memory is 32 GB and we have allocated SGA = 20 GB and PGA = 4 GB

>free -g

             total       used       free     shared    buffers     cached

Mem:            30         30          0          0          0         18

-/+ buffers/cache:         11         18

Swap:           23          2         21

Here are the file systems

/dev/mapper/VGora1-lvora1 on /u01 type ext3 (rw)

/dev/mapper/VGora2-lvora2 on /u02 type ext3 (rw)

/dev/mapper/VGora3-lvora3 on /u03 type ext3 (rw)

/dev/mapper/VGora4-lvora4 on /u04 type ext3 (rw)

We noticed that after large I/O (e.g. RMAN full backup is written to the disk or we take data pump export) the system gradually starts to slow down and then eventually become unresponsive and had to be rebooted to make it to work again. Can someone please guide us as to what are some of the things / settings we could look into?

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