System information

Advanced Functions
5-4
5.1.4 Windows Multi-Path Solution: PathGuard
PathGuard is the bundled multi-path IO solution for Windows platforms, and it is based on Microsoft Multipath I/O (MPIO)
framework. PathGuard consists of MPIO drivers and a web-based path manager GUI that allows you to manage MPIO
configurations for multiple host computers.
The MPIO drivers include standard drivers from Microsoft and DSM (Device Specific Module) provided by the RAID
system supplier.
For more information about Microsoft MPIO, please visit the link below:
http://www.microsoft.com/windowsserver2003/technologies/storage/mpio/default.mspx
The following steps are required for enabling PathGuard MPIO:
1. Complete the hardware and software setup at RAID systems
2. Install the PathGuard package to the host computer
3. Register the vendor name and model name of your RAID system to the PathGuard (optional)
4. Install the PathGuard MPIO driver
5. Reboot the host computer
6. Launch PathGuard GUI to set multi-path policies
Windows MPIO framework requires rebooting the host computer when enabling the MPIO driver on the host computer,
such that the regular disk device drivers will be replaced by the MPIO disk drivers. Windows can properly detect multi-
path disks only during MPIO driver installation, so reconfiguration (like adding/removing paths or LUNs) requires you to
reinstall the PathGuard MPIO driver and reboot the host computer. You might need also to manually rescan the physical
drives (use Computer Management > Storage > Disk Management) When multi-path disks are not properly detected.
• Install and Uninstall PathGuard
To install the PathGuard, double click the installation file on a host computer (choose the 32-bit or 64-bit installation file
according to your host system). And follow the on-screen instructions to start the installation. After the installation, you
can install MPIO driver or use PathGuard GUI.
Click the Start > Programs > PathGuard > readme read the online help page. To uninstall the PathGuard, click Start >
Programs > PathGuard > Uninstall PathGuard.
• Register RAID system to MPIO Driver (optional)
The MPIO driver is only applied to the RAID systems that have vendor names and model names in the PathGuard device
database.
PathGuard is delivered with predefined database, but if the MPIO driver cannot recognize your RAID systems, you may
need to contact your supplier to get the updated PathGuard software or simply add the name of your RAID systems to the
PathGuard database.
A software utility can be found to do so at Start > Programs > PathGuard > Driver > Update New Model. After entering
the vendor name and model name, press the Enter button to confirm the change. You can now re-install the MPIO driver
and reboot the host computer to make it effective.
• Install and Uninstall MPIO Driver
You need to install MPIO driver only on a host computer connected with RAID systems. If you use PathGuard GUI only
for managing MPIO of remote sites, you need not to install the MPIO driver.
To install the MPIO driver, click Start > Programs > PathGuard > Driver > Install MPIO Driver, and to uninstall it, click
Start > Programs > PathGuard > Driver > Uninstall MPIO Driver. Reboot the host computer, and you have completed
the installation or un-installation.
Tasks Instructions
Select Storage Provisioning method RAID Management > Storage Provisioning > Symmetric
Add WWPN of HBAs to hosts HBA0 WWPN -> Host 0
HBA1 WWPN -> Host 1
HBA2 WWPN -> Host 2
HBA3 WWPN -> Host 3
Add hosts to one host group Host 0 and Host 1 -> Host Group 0
Host 2 and Host 3 -> Host Group 0
Map LUNs to host groups DG0LD0 and DG0LD1 -> Host Group 0
DG1LD0 and DG1LD1 -> Host Group 0