Re: Possible reasons for load average high and CPU 90% idle on RHEL 7.6

Hi,

Linux load averages include processes in the uninterruptible sleep (D) state (disk I/O wait usually):
https://www.brendangregg.com/blog/2017-08-08/linux-load-averages.html

You can check historic sar -d for avgqu-sz. It can get ridiculously high if you have lots of processes waiting for I/O.

On Mon, 23 Aug 2021 at 12:29, Goti <aryan.goti_at_gmail.com> wrote:

> HI Listers,
>
> We had a situation where the load average spiked to more than 2000+ and
> continued the saw way for about 45 minutes. During this entire time we had
> CPU 95% idle. One thing that was observed was that we had a sudden increase
> in the number of connections from 1800 to around 3700. We had 90Gb of free
> memory throughout when the load average spiked.
>
> Server has 48 CPU with 512 Gb of RAM running on RHEL 7.6.
>
> Is this something expected?
>
>
> Thanks,
> Goti
>

--
http://www.freelists.org/webpage/oracle-l