content_image/1001094.jpg
## Power option setting for the highest performance 

Select Control Panel →  Hardware →  Power Options . In the window, select the High performance  Windows power plan option, as shown in Figure 6-14. 

<img src='content_image/1001094.jpg'>

## Optimum disk command timeout settings 

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 . 

## 6.3.7 FlashSystem 900 and client VMware ESX hosts 

Adjust the following key to your needs: 

HKLM\System\CurrentControlSet\Services\Disk\TimeOutValue 

Consider the following points: 

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 . 

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. 

