Dell PowerEdge R720

https://i.dell.com/sites/csdocuments/Shared-Content_data-Sheets_Documents/ja/jp/Dell-PowerEdge-R720Technical-Guide-2018Jun.pdf

• MB:
  • Intel C602 Chipset
  • Manufacturer: Dell Inc. / Product Name: 0020HJ /Version: A02
  • 2 x LGA2011 socket
  • MAX CPU Xeon E5-2697v2 12 core @ 2.7GHz (30MB cache)
• CPU:
  • 2 x Intel(R) Xeon(R) CPU E5-2650 v2 @ 2.60GHz (max speed 3.4GHz) 8C/16T IvyBridge based (20MB cache)
• LSI SAS2 MPT Controller SAS2308 (PCI ID 0x2:0x0:0x0)
  • mpt2sas_cm0: LSISAS2308: FWVersion(20.00.07.00), ChipRevision(0x05), BiosVersion(07.27.01.01)
• BIOS Information
  • Vendor: Dell Inc.
  • Version: 2.9.0
  • Release Date: 12/06/2019

• F2 Enter to setup
• System BIOS
  • Memory Settings
    • System Memory Testing to Disabled
  • Integrated Devices
    • Slot Disablement
      • Disable all not needed options Boot Driver Disabled
    • Boot Settings
      • UEFI Boot Settings
        • Boot Option Enable/Disable - disable all unneeded
• iDRAC Settings
  • Lifecycle Controller
    • Disabled

Setting not accessible from IDRAC. Need to use IDRAC console, reboot machine and enter to setup (F2). In setup it is possible to setup:

• AC Power Recovery: On (when it is Last system remains off after gracefull shutdown)
• AC Power Recovery Delay: random - to prevent huge peak consumption when power is restored

Other possibilities - use Linux software to modify BIOS settings:

• Install racadm for iDRAC on Proxmox 7/8
• https://serverfault.com/questions/824676/can-i-configure-ac-power-restored-option-via-idrac-on-a-dell-poweredge-server
• Installing Dell iDRAC Tools (including racadm) on Ubuntu / Debian + Common RACADM commands
• https://www.dell.com/support/home/en-us/drivers/driversdetails?driverid=df1nd
• https://gist.github.com/WietseWind/e4cffd3a3cdc7728945edcf2b5b7be7d

• Overview –> Server –> Logs –> Settings
• Overview –> Server –> Alerts
  • Enable Alerts
  • Setup Alerts Filter
  • Enable checkmark in column Remote System Log. NOTE: there are multiple pages of alerts. There is no need to click apply before changing page.
  • test remote syslog using Test Event at bottom of page

Despite of BIOS setting to performance kernel changes it during boot:

kernel: ENERGY_PERF_BIAS: Set to 'normal', was 'performance'

https://support.scc.suse.com/s/kb/Boot-log-displays-ENERGY-PERF-BIAS-Set-to-normal-was-performance?language=en_US:

The EPB MSR (ENERGY_PERF_BIAS Machine Specific Register) is a feature of some Intel CPUs.  It can be set to a value from 0-15 to tell the CPU (microcode) whether it should prefer performance (0) over powersave (15) power management.
Intel has observed that on many systems after the hardware platform firmware (BIOS/UEFI) finishes initialization, the initial EPB value is 0 ('performance').  While on some systems this is intentional, on others it is due to the system firmware (UEFI/BIOS) not properly initializing the value of the EPB MSR.  Intel implemented a fix in the Linux kernel EPB initialization code to set the EPB to value of 6 ('normal') when the Linux kernel boots.  After the kernel finishes loading a proper EPB value can then be selected.  Unfortunately, this causes a bit of an inconvenience on systems where the system firmware deliberately set EPB to 0 as they will need to set the value back to 0 after Linux loads.  However, other systems (where the EPB value is 0 due to not having been properly initialized) have a higher power consumption than intended/desirable which can cause issues for systems operating from battery power (standby/ups power, or laptops).

ENERGY_PERF_BIAS:

• 0 - performance
• 4 - balance-performance
• 6 - normal
• 8 - balance-power
• 15 - power (max power saving)

apt instal linux-cpupower
 
# x86_energy_perf_policy
cpu0: EPB 6
cpu1: EPB 6
...
cpu30: EPB 6
cpu31: EPB 6
 
# x86_energy_perf_policy balance-performance