slow running on RHEL AS3

[Ryan Lee]

Hardware Config :
8xCPU, 16GB memory, qlogic 2310f, EMC SAN, hp proliant DL740 Server with smart array 5i.

when the memory usage is full. the system very slow even a ls / df command.

Plase help if you have any idea.

Attacted info about command result
SysRq Memory
stat
meminfo

[Stuart Browne]

Some more details if I could please.

What kernel revision are you running ('rpm -q kernel' and 'uname -r') ?

What directory and how many files are in the directory where you report slow ls/df responses? (or is it every directory?).

What driver version are you using for the fibre channel controller? (use 'modinfo ', or attach '/var/log/dmesg').

What's the load averate usually report?

[Ryan Lee]

I using kernel-smp-2.4.21-15.0.4EL and qla2300 driver version is 6.07.02-RH2. the qla2300 attacted to EMC SAN, our Data szie around 400GB

[Don_89]

You should be running the Enterprise kernel, this is for larger smp systems (4+cpu) and high memory configurations..

Second, your system is using 530MB of RAM for the OS & applications. The rest is being used for disk cache. Memory isn't the issue.

Are you booting the OS off the SAN or are you using local disks? Also, what is the primary application on this system?

[dirk dierickx]

have you tried looking at the number of processes and how much cpu they take? or it could also be one (or more) process is doing so much io it is killing the system.

[Ross Minkov]

using sar might be a good idea for that system... or any other performance data collecting tools you might have at hand.

[Ryan Lee]

I remove memory to 8GB Memory, But the system still slow and hang. I updated qlogic qla2300-7.03 and kernel-2.4.21-20ELsmp.
When I umount EMC SAN, the RHEL will back to nomarlly.

Do you kwon what is module of qla2300_conf.