You can check if cstates are enabled with cat /proc/acpi/processor/info. Look for power management: yes/no.
If they are enabled then you can check the current cstate of each core. 0 is the CPU's normal operating range, any other state means the processor is in a power saving mode. cat /proc/acpi/processor/CPU?/power.
cstates are configured in the bios so a reboot is required to change them. I know with Dell servers you can trigger the change with omconfig and then issue a reboot for it to take effect. Otherwise you'll need to disable it directly in the bios.
As for the SSD's I would just run iostat and check the iowait. If you see small disk writes causing high iowait then your SSD's are probably at the end of their life. Ceph journaling is good at destroying SSD's.
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