Overland Storage REO 9000 with ProtectionPAC Software
Setting the SCSI Time-Out Value in Windows Environments
If you intend to use your REO Appliance in a Windows environment, be aware that there are certain operating conditions in which time-out errors might occur. These errors usually result in the system reporting a disk failure for the associated REO Appliance disk drive or drives. (These errors might be reported as iSCSIPrt errors in the System Log of the Event Viewer. Examples include an Event ID 9 [Target did not respond in time for a SCSI request…] and Event ID 39 [Initiator sent a task management command to reset the target…]. Other symptoms might include “Lost Delayed Write Data” system error messages or similar error messages related to the REO Appliance disk drives.)
The reason that these disk time-out errors can occur is because the default I/O time-out value for Windows is 20 seconds, which is not sufficient to support the default iSCSI protocol time-out value of 60 seconds. When you install and set up your REO Appliance, Overland strongly recommends that you set this value to 60 seconds.
To set the time-out value to 60 seconds
1On the Windows system, run regedit.
Warning: If you edit the registry incorrectly, you might cause serious problems that require you to reinstall your operating system. Edit the registry at your own risk. Prior to making any changes, refer to the following Microsoft Knowledge Base article: http://support.microsoft.com/default.aspx?scid=kb;en-us;322755
2In HKEY_LOCAL_MACHINE\System\CurrentControlSet\ Services\Disk, edit or add the TimeOutValue entry to set it to 60 seconds in decimal format ((0000003c in hexadecimal).
To edit the value for the TimeOutValue entry if it already exists, double-click the entry, enter the new value, and click OK.
To add the TimeOutValue entry if it does not yet exist, right-click anywhere in the list of values, and then click New > DWORD value. Name the new value TimeOutValue, and then double-click it to edit the setting.
18 X Reviewing REO 9000 Concepts and Requirements
