Draft Document for Review January 13, 2020 5:02 pm 8456ch_RAS.fm Figure 3-10 on page 95 shows the power control settings window of the Storage  Management GUI. Figure 3-10 DS8900F Modify power control settings from the Storage Management GUI In addition, the following switches in the management enclosure (ME) of a DS8900F are  accessible when the ME cover is open:  GLYPH<SM590000> Local mode jumper connector. This connector on the local remote switch card is for  service use only and there is a plug to set the system in the local power control mode.  GLYPH<SM590000> The local power on/local force power off switch (white switch) is also located on the local  remote switch card in the ME. This switch can manually power on or force power off the  complete system if the local remote switch card is in local power control mode. When the  local/remote switch card is in remote power control mode (nothing plugged in the local  mode jumper connector), the HMCs are in control of power on/power off (this is the default  condition for client usage). GLYPH<SM590000> Powering Off the storage system with the white switch is a forcefully shutdown and  includes also the procedure of moving NVS data to the flash portion of the NVDIMMs  which needs to be destaged on the next system power on and boot up.  Important:  The Local/remote power off switch (white switch) must not be used by  DS8900F users. The switch can be used only under certain circumstances and as part of  an action plan or problem determination that is performed by an IBM SSR. Chapter 3. DS8900 reliability, availability, and serviceabilty  95