LVM Striping

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I am using RHCS cluster(two nodes) for database(oracle 11g). I have mounted data volumes from storage (HP XP 24000). I have done LVM striping. I am using 4 LUNs (each size of 500gb) a total of 2TB. I created LV with I-4 and i-256, as switch parameter. I am suffering from batch processing on my DB server. Some times server get hangged and memory usage become very high. (out of 64gb, oracle uses all the memory) finally turning to server hang. Please suggest.

Affected LV details is as below:=>

[root@MPJBPDCCCB1 ~]# lvdisplay -v /dev/mapper/ccb_vgdata-ccb_lvdata
Using logical volume(s) on command line
--- Logical volume ---
LV Name /dev/ccb_vgdata/ccb_lvdata
VG Name ccb_vgdata
LV UUID AzCy0B-Pjbo-avY7-LeEc-Ymxk-MY8Z-8OrxA0
LV Write Access read/write
LV Status available
# open 1
LV Size 1.95 TB
Current LE 512000
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 4096

Block device 253:85

Striping details for the same LV is as below:=>

ccb_lvdata ccb_vgdata -wi-ao 4 striped 1.95T

Please suggest!