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kworker processes are normal on any Linux system. That they are using up so much CPU is strange. You should show the whole TOP screen. Is there a lot of I/O wait? Most likely they are caused by disk or network I/O or interrupts because of other services, such as that mysql process.
kworker's are kernel [worker] threads FYI
@rcxb
i see everything is normal. nothing is overload.
Hello,
I reset the server and now it can't boot to OS. the IPMI not work too. but in email from support they show me screenshot of IPMI like this
I can boot to rescue mode but can't fix grub. Someone can help me to fix it? Thank you.
Regards,
seeing that you use xfs, that could have been the cause for the load. scrubbing or whatever. rebooting most likely didn't help if something was trying to recover or realign.
for grub, you are simply doing it wrong. if you already mounted your boot partition to /mnt/boot , you shouldn't mount something else to /mnt then. needs to be done the other way around.
you also need to bind mount proc sys dev before you chroot into that, that's also why grub2-install is complaining and the error message is quite clear about it ;-)
hope you have a good learning curve - good luck.
@Falzo so in this case, what should i do get the server to normal?
the OVH support was fixed for my server. thank all guys.
for trying to fix grub, just google it. as I wrote before, you most likely mounted your root partition and boot in the wrong order and missed to also bind mount dev/sys/proc before chrooting into the system.
for the kworker load you probably have to check what's the xfs and raid status looks like, while it occurs...