disk overoladed by swap (maybe?) help!

[Roberto Martinez_2]

Hi, we have an rp7410, 4cpus, 2Gb RAM, 2 mirrored internal disks, having heavy performance problems. Apparently the bottleneck is in the I/O, and I'm assuming it's due to lack of memory and swapping work, but I'm not completely sure. I attach in this message the sar -A output.
As you can see, the disk activity is about 100% busy, and the cpus are almost idle (i send the "top" output also).

The questions:
-Is there a way to verify that disk activity is mostly due to swap operation?
-Is there a way to reduce the overload while the memory cards arrive?

Thank you very much in advance.

[Robert-Jan Goossens]

Hi Roberto,

# swapinfo -tam

could you check the syslog.log file for errors.

Regards,
Robert-Jan

[Pete Randall]

Run "vmstat 1 10" and look at the "po" column. A number greater than single digits in this column indicates significant paging/swapping activity.


Pete

[Roberto Martinez_2]

# swapinfo -tam
Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 4096 223 3873 5% 0 - 1 /dev/vg00/lvol2
reserve - 699 -699
memory 1526 1351 175 89%
total 5622 2273 3349 40% - 0 -


no errors in syslog.log

[Roberto Martinez_2]

"po" is mostly 0, and "pi" varies between 0 and 4... Does it mean that there's no memory problems? Or just that the amount of disk in the total memory allocated by processes is significantly big?

[Roberto Martinez_2]

Is there a way to chek the I/O statistics per lvol?