Hi All,
I am doing core reduction on RHEL 6 servers, during testing phase what is observed is after core reduction , putty session stops.
ping to server also fails.
however server is up, (logged directly on windows hypervisor).
I ran following script at boot ,(creating a sym link in /etc/rc3.d directory)
#!/bin/bash
for i in {12..15}
do
echo "Reducing core cpu$i"
echo 0 > /sys/devices/system/cpu/cpu$i/online
echo "Core Reduced (cpu$i)"
done
echo "$(nproc) cores available"
##################################
server remains up for sometime then putty session closes
From logs i can see
: CPU 15 is now offline
Oct 26 15:56:41 NWLOG kdump: kexec: unloaded kdump kernel
Oct 26 15:56:41 NWLOG kdump: stopped
Oct 26 15:56:41 NWLOG kdump: kexec: loaded kdump kernel
Oct 26 15:56:41 NWLOG kdump: started up
Oct 26 15:56:41 NWLOG kdump: kexec: unloaded kdump kernel
Oct 26 15:56:41 NWLOG kdump: stopped
Oct 26 15:56:42 NWLOG kdump: kexec: loaded kdump kernel
Oct 26 15:56:42 NWLOG kdump: started up
Oct 26 15:56:42 NWLOG kdump: kexec: unloaded kdump kernel
Oct 26 15:56:42 NWLOG kdump: stopped
Oct 26 15:56:42 NWLOG kdump: kexec: loaded kdump kernel
Oct 26 15:56:42 NWLOG kdump: started up
Oct 26 15:56:42 NWLOG kdump: kexec: unloaded kdump kernel
Oct 26 15:56:42 NWLOG kdump: stopped
Oct 26 15:56:42 NWLOG kdump: kexec: loaded kdump kernel
Oct 26 15:56:42 NWLOG kdump: started up
Oct 26 15:56:42 NWLOG kdump: kexec: unloaded kdump kernel
Oct 26 15:56:42 NWLOG kdump: stopped
Oct 26 15:56:50 NWLOG irqbalance: WARNING, didn't collect load info for all cpus
, balancing is broken,,
for all cpus i made offline.
Please suggest.
Thanks