====== 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



===== boot speedup =====
  * ''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

===== AC loss recovery =====

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:
  * [[https://blog.williamdes.eu/Infrastructure/tutorials/install-dell-idrac-racadm-on-proxmox-7/|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]]
  * [[https://www.dell.com/support/home/en-us/drivers/driversdetails?driverid=0992n|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]]

===== idrac syslog =====

  * 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


===== ENERGY_PERF_BIAS =====

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

<code bash>
kernel: ENERGY_PERF_BIAS: Set to 'normal', was 'performance'
</code>

[[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 (140W)
  * 3 - (140W)
  * 4 - balance-performance (126W)
  * 6 - normal (126W)
  * 8 - balance-power
  * 15 - power (max power saving) (126W)
 
<code bash>
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
</code>

<code bash>
ipmitool sensor reading 'Pwr Consumption'
</code>