Compute

Hyperconverged infrastructure

Everyone wants their cake and wants to eat it too. Especially when you have around 100 cores per multisocket socket machine with few TB of RAM loaded with tens of TB NVMEs. Request to get a shared cluster of everything is not so uncommon.

NUMA

To avoid interfering with different services, it seems plausible to sort the running process.
It also disciplines rogue clients and helps service providers with QOS management.
Also, if it's overcommitted, it's much easier to communicate why things are slow.

ps aux  | grep libvirt  | grep -v grep | awk '{print$2}' | while read line; do 
    echo taskset -cp "${vm0}-${numa0_end},${vm1}-${numa1_end},${vm2}-${numa2_end},${vm3}-${numa3_end}" "${line}"; done | sh 1>/dev/null

virsh list  | awk '/inst/ {print $2}' | while read l;do 
    for i in $(seq 0 $(virsh dominfo $l |awk '/CPU\(/ {print$2-1}')); do 
        virsh vcpupin $l $i "${vm0}-${numa0_end},${vm1}-${numa1_end},${vm2}-${numa2_end},${vm3}-${numa3_end}" 1>/dev/null
        #virsh vcpupin $l $i "1-255" 1>/dev/null
    done 
done

Be not so nice

If it waits behind storage, then the system slows down. Prioritize shared storage proceses.

ps -e -o pid,uid,ppid,pri,ni,cmd | awk '/ceph-osd/  &&  !/-20/ && !/awk/ {print "renice -n -20 -g",$1,";ionice -c 1 -n 1 -p",$1}'  | sh

GRUB

Boot from the mdraid GPT partition one.

grub> ls
grub> set root=(md/0,gpt1)
grub> linux (md/0,gpt1)/boot/vmlinuz-6.8.0-106-generic root=/dev/md0p1
grub> initrd (md/0,gpt1)/boot/initrd.img
grub> boot

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This saved you a night? I do this for a living: info@wirt.ee.