How to check into Linux OS

I learned some experience while Nanjing found 0x03 error. At begining, we don't know why our GSRM(a linux process) hang in a short time 5 seconds sometimes. It didn't handle any message at that time and the interruption is not regularly. So we assume we have Linux OS problem. We did following checks: 1. Turn off Iptables service.
[root@Motorola-SRM-1A ~]# iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination        
ACCEPT     tcp  --  Motorola-SRM-1A      anywhere            tcp dpt:glrpc flags:FIN,SYN,RST,ACK/SYN
ACCEPT     tcp  --  10.0.0.2             anywhere            tcp dpt:glrpc flags:FIN,SYN,RST,ACK/SYN
ACCEPT     tcp  --  Motorola-SRM-1B      anywhere            tcp dpt:glrpc flags:FIN,SYN,RST,ACK/SYN
DROP       tcp  --  anywhere             anywhere            tcp dpt:glrpc flags:FIN,SYN,RST,ACK/SYN
ACCEPT     tcp  --  Motorola-SRM-1A      anywhere            tcp dpt:sqlexec flags:FIN,SYN,RST,ACK/SYN
ACCEPT     tcp  --  10.0.0.2             anywhere            tcp dpt:sqlexec fl