HP MSA Controllers - Manual (Page 57)

Chapter 4 Configuring a System for the First Time 57
Optimizing iSCSI Initiator Parameters
To optimize performance, edit the following two iSCSI initiator registry keys:
■ LinkDownTime: Edit this key to increase the amount of time that the host
allows for failover on the controller enclosure before removing the controller
from the system.
■ MaxTransferLength: (Optional) The default registry setting for maximum size
per I/O transfer is 256 KB. This results in larger transfers being segmented into
multiple commands. If your application requires I/O transfers larger than 256
KB, edit this setting.
1. Locate and select the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\
{4D36E97B-E325-11CE-BFC1-08002BE10318}
Instances will be listed below the key using automatically generated (GUIDs).
Example: 0000,0001
2. Select and perform the following steps for each instance ID:
a. Check to see whether the DriverDesc parameter is set to Microsoft iSCSI
Initiator .
If not, skip to the next interface ID.
b. If so, double-click to open the instance and then to open Parameters .
c. Edit the LinkDownTime key. The default value is 0x0f(15) . Change this to
0x30(48) .
d. (Optional) Edit the MaxTransferLength key value. The default value is
0x40000 (256 KB). Common values to use instead are 0x80000 (512 KB),
0x100000 (1 MB), or 0x200000 (2 MB).
3. Exit the Registry Editor.
4. Restart Windows for the new settings to take effect.