Setup Guide

Parameter Recommended Value

(Decimal)

HKEY_LOCAL_MACHINE\System\Current ControlSet\Services\mpio

\Parameters\UseCustomPathRecoveryInterval

4. Verify Microsoft Windows Guidelines

Application-Specific Events

Applications that run in an iSCSI environment are sometimes directly affected by logging various events. The following

section discusses specific applications that might be affected by iSCSI SAN events and settings.

NOTE: You might notice some iSCSI SAN messages in the event log. These events have no impact on operations.

Microsoft Windows Applications

While most of the applications running in Windows rely on the OS and the software initiator to manage and track

storage access, a few applications inform or log occurring I/O events or take independent actions based on the

availability of the storage subsystem in use.

You can expect some events to be tracked in your Windows systems while access to the back-end SAN has been

temporarily delayed due to a failover event.

Microsoft Exchange Server

The Exchange Server database engine (ESE) reports every I/O that requires more than 60 seconds to the event log, and

as of Exchange Server version 2010 takes additional actions as shown in Table 3. I/Os Requiring More Than 60 Seconds.

Table 3. I/Os Requiring More Than 60 Seconds

Exchange Version I/O Type I/O Times Behavior

Exchange Server 2010 RTM Completed >60 seconds

Write to event log;

ESE performs clean-page

overwrite on pages

affected by slow I/O

Exchange Server 2010 SP1 In flight >60 seconds Write to event log

>4 minutes Terminate wininit.exe

process and bugcheck the

server

Completed >30 seconds

Write to event log;

ESE performs clean-page

overwrite on pages

affected by slow I/O

For more information about this behavior, refer to Microsoft Technet at:

technet.microsoft.com/en-us/library/ff625233.aspx

Set Delay Between Login Attempts

The DelayBetweenReconnect parameter sets the delay between each attempt to log in again. The default value is

5 seconds, but Microsoft recommends setting it to 1 second.

Configure Your Microsoft Windows Operating System