Power option setting for the highest performance Optimum disk command timeout settings Select  Control Panel  Hardware  Power Options . In the window, select the  High  performance  Windows power plan option, as shown in Figure 6-14. Adjust the disk  TimeOutValue  parameter on the Windows operating system for more reliable  multipath access. Windows operating systems feature a default disk command  TimeOutValue  of 60 seconds. If a  SCSI command does not complete, the application waits 60 seconds before an I/O request is  tried again. Because this behavior can create issues with most applications, you must adjust  the disk  TimeOutValue  in the registry key to a lower value. For more information about setting  this value, see the Microsoft TechNet website at  https://technet.microsoft.com/en-us/library/aa997069(v=exchg.80).aspx . Adjust the following key to your needs:  HKLM\System\CurrentControlSet\Services\Disk\TimeOutValue Consider the following points: The FlashSystem 900 can be attached to VMware ESX client hosts by using the FC method. Arbitrated loop topology is required when you attach the IBM FlashSystem 900 directly to the  client VMware ESX hosts. Note:  The FlashSystem 900 16 Gbps FC attachment does not support arbitrated loop  topology. The IBM FlashSystem 900 must be connected to a SAN switch when 16 Gbps  FC is used if the host operating system does not support point-to-point FC direct  connections. If arbitrated loop is required by the client host, connect at 8 Gbps FC to the  IBM FlashSystem 900. Chapter 6. IBM FlashSystem 900 client host attachment and implementation  171 6.3.7 FlashSystem 900 and client VMware ESX hosts GLYPH<SM590000> For a disk in a  nonclustered  configuration, set  TimeOutValue  to  10 . GLYPH<SM590000> For a disk in a  clustered  configuration, set  TimeOutValue  to  20 . Figure 6-14 Windows Power Options