HP MPIO Installation and operating manual

installation and reference guide
HP MPIO Full Featured DSM for
EVA4x00/6x00/8x00 family of Disk
Arrays 3.00.00
Part number: AA-RW7SJ-TE
First edition: February 2008

Legal and notice information
©Copyright 2006--2008Hewlett-PackardDevelopment Company,L.P.
Confidential computer software. Valid license from HP required for possession, use or copying. Consistent with FAR 12.211 and
12.212, Commercial Computer Software, Computer Software Documentation, and Technical Data for Commercial Items are licensed
to the U.S. Government under vendor’s standard commercial license.
The information contained herein is subject to change without notice. The only warranties for HP products and services are set forth
in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting
an additional warranty. HP shall not be liable for technical or editorial errors or omissions contained herein.
Microsoft, Windows, Windows Server 2003, and Windows Server 2008 are U.S. registered trademarks of Microsoft Corporation.

Contents
Aboutthisguide .......................... 7
Intendedaudience...................................... 7
Relateddocumentation.................................... 7
Documentconventionsandsymbols .............................. 8
HPtechnicalsupport..................................... 9
HP-authorizedreseller .................................... 9
Helpfulwebsites ...................................... 9
1 Installing the HP MPIO Full Featured DSM for EVA4x00/6x00/8x00 family
ofDiskArrays ........................... 11
Preparingforinstallation ................................... 11
InstallingHPMPIOEVADSM ................................ 12
InstallingHPMPIOEVADSMonstand-alonesystems.................... 12
Installing HP MPIO EVA DSM on cluster configurations ................... 13
UpgradingHPMPIOEVADSM ............................... 13
UpgradingHPMPIOEVADSMonstand-alonesystems ................... 13
Upgrading HP MPIO EVA DSM on cluster configurations................... 13
Migrating from Windows Server 2003 to Windows Server 2008 with HP MPIO EVA DSM . . . . . . 14
RemovingHPMPIOEVADSM................................ 14
Usingsilentinstallation................................... 15
InstallingHPMPIOEVADSM .............................. 16
UpgradingHPMPIOEVADSM ............................. 17
RemovingHPMPIOEVADSM.............................. 17
Creating response filesforsilentmodeoperations ..................... 17
SettingupbootfromSAN.................................. 18
2SupportforloadbalancinginFailoverClusterServerenvironmentfor
Windows Server 2008 . ...................... 19
Recoveringinaccessiblediskdevices ............................. 19
3 Support for load balancing in Microsoft Cluster Server environment for
Windows Server 2003 . ...................... 21
EnablingsupportforloadbalancinginMSCSenvironments ................... 21
DisablingsupportforloadbalancinginMSCSenvironments................... 22
Recoveringinaccessiblediskdevices ............................. 23
4AdaptiveLoadbalance ..................... 25
5 Managing storage arrays using the HP MPIO EVA DSM with the CLI utility 27
hpdsmdevices ...................................... 27
hpdsmdevicesall ..................................... 28
hpdsmpathsdevice .................................... 28
hpdsmsetdevicepolicy .................................. 29
hpdsmsetdevicealb.................................... 30
hpdsmsetdevicepath ................................... 30
hpdsmcleanupdevice ................................... 30
hpdsmnotify ....................................... 31
HP MPIO Full Featured DSM for EVA4x00/6x00/8x00 family of Disk Arrays 3.00.00 3

hpdsmhelp........................................ 32
ASoftwarecomponents . ..................... 33
Drivers.......................................... 33
Usermodecomponents................................... 33
HPMPIODSMmanagerGUI .............................. 33
HPMPIOEVADSMcommandlineinterface(CLI)...................... 33
HPMPIOEVADSMperformancemonitoringprovider.................... 34
HPMPIOEVADSMpersistentreservationsclearutility.................... 34
hpprutildevices.................................. 34
hpprutilcleardevice................................ 34
hpprutilhelp ................................... 35
BMultipathingdrivereventlogmessages............... 37
MPIO.SYSeventlogmessages................................ 37
HPMPIOEVADSMeventlogmessages............................ 39
C Managing MPIO devices using Microsoft-provided interfaces on Windows
Server2008............................ 41
MultipathI/Ofeature ................................... 41
Managingmultipathsupport ................................ 41
MPIO-edDevices ................................... 41
DiscoverMulti-paths .................................. 42
DSMInstall...................................... 43
Managingmultipathdiskdevices .............................. 44
DTroubleshooting . . ....................... 49
Glossary.............................. 51
Index .............................. 53
4

Figures
1MPIOPropertiespagewithMPIO-edDevicestabenabled .............. 42
2MPIOPropertiespagewithDiscoverMulti-Pathstabenabled ............. 43
3MPIOPropertiespagewithDSMInstalltabenabled................. 44
4Multi-Path DiskDevicePropertiespage....................... 45
5Multi-PathDiskDevicePropertiespage....................... 46
6Multi-PathDiskDevicePropertiespage....................... 47
7MPIOPathDetailspage............................. 48
HP MPIO Full Featured DSM for EVA4x00/6x00/8x00 family of Disk Arrays 3.00.00 5

Tables
1Documentconventions............................... 8
2Pre-installationchecklist ............................. 12
3Notificationstrings ............................... 31
4MPIO.SYSeventlogmessages .......................... 37
5HPMPIOEVADSMeventlogmessages ...................... 39
6HPDSMequivalentloadbalancepolicies ..................... 46
6

About this guide
This guide provides information about HP MPIO Full Featured Device SpecificModule(DSM)for
EVA4x00/6x00/8x00 family of Disk Arrays (called the “HP MPIO EVA DSM” throughout this guide),
including:
•Installing, upgrading, and removing HP MPIO EVA DSM
•Support for load balancing in Microsoft Cluster Server (MSCS)/Failover Cluster environments
•Managing HP MPIO EVA DSM
Intended audience
This document is intended for users of HP MPIO EVA DSM and users who are experienced with the
following:
•Microsoft Windows Server 2003 (x86, IA64 and x64)
•Microsoft Windows Server 2008 – Server Core (x86, IA64 and x64)
•Microsoft Windows 2008 Server core (x86 and x64)
•EVA4000/4100/4400, EVA6000/6100, and EVA8000/8100 disk arrays
•Microsoft Cluster Server (MSCS)/Failover Cluster environments
Related documentation
In addition to this guide, see HP MPIO Full Featured DSM for EVA4x00/6x00/8x00 family of Disk
Arrays release notes.
Additional documentation, including whitepapers and best-practices documents, is available at
http://www.hp.com
HP MPIO Full Featured DSM for EVA4x00/6x00/8x00 family of Disk Arrays 3.00.00 7

Document conventions and symbols
Table 1 Document conventions
Convention Element
Medium blue text: Related
documentation Cross-reference links and e-mail addresses
Medium blue, underlined text
(http://www.hp.com)Web site addresses
Bold font
•Key names
•Text typed into a GUI element, such as into a box
•GUI elements that are clicked or selected, such as menu and list
items, buttons, and check boxes
Italic font Text emphasis
Monospace font
•File and directory names
•System output
•Code
•Text typed at the command line
Monospace, italic font •Code variables
•Command-line variables
Monospace, bold font Emphasis of file and directory names, system output, code, and text
typed at the command line
WARNING!
Indicates that failure to follow directions could result in bodily harm or death.
CAUTION:
Indicates that failure to follow directions could result in damage to equipment or data.
IMPORTANT:
Provides clarifying information or specific instructions.
NOTE:
Provides additional information.
8About this guide

HP technical support
Telephone numbers for worldwide technical support are listed on the HP support web site:
http://www.hp.com/support/
Collect the following information before calling:
•Technical support registration number (if applicable)
•Product serial numbers
•Product model names and numbers
•Applicable error messages
•Operating system type and revision level
•Detailed, specificquestions
For continuous quality improvement, calls may be recorded or monitored.
HP recommends that customers sign up online using the Subscriber’s choice web site:
http://www.hp.com/go/e-updates
•Subscribing to this service provides you with e-mail updates on the latest product enhancements,
newer versions of drivers, and firmware documentation updates as well as instant access to
other product resources.
•After signing up, you can quickly locate your products by selecting Business support and then
Storage under Product Category.
HP-authorized reseller
For the name of your nearest HP-authorized reseller:
•In the United States, call 1-800-282-6672.
•Elsewhere, visit the HP web site: http://www.hp.com.ThenclickContact HP to find locations and
telephone numbers.
Helpful web sites
For other product information, see the following HP web sites:
•h
ttp://www.hp.com
•http://www.hp.com/go/storage
•http://www.hp.com/support/
•http://www.docs.hp.com
HP MPIO Full Featured DSM for EVA4x00/6x00/8x00 family of Disk Arrays 3.00.00 9

10 About this guide

1 Installing the HP MPIO
Full Featured DSM for
EVA4x00/6x00/8x00 family
of Disk Arrays
HP MPIO Full Featured Device Specific Module (DSM) for EVA Disk Arrays (HP MPIO EVA DSM) provides
multipathing support for HP StorageWorks EVA disk arrays on Windows platforms using the Microsoft
Multipath Input-Output (MPIO) framework. This chapter describes the following:
• Preparing for installation
• Installing HP MPIO EVA DSM
• Upgrading HP MPIO EVA DSM
• Migrating from Windows Server 2003 to Windows Server 2008 with HP MPIO EVA DSM
•RemovingHPMPIOEVADSM
• Using silent installation
• Setting up boot from SAN
Preparing for installation
Before installing HP MPIO EVA DSM, verify that your system components support the HP MPIO EVA DSM
and determine whether you need to upgrade hardware or software before installation.
To prepare your system for the installation of HP MPIO EVA DSM:
1. Complete the pre-installation checklist (Table 2).
2. Install all hardware components, as described in the hardware installation and configuration
documentation.
3. Install any required operating system service packs.
4. Back up all user data.
5. Log in with administrator privileges.
6. Ensure that no other installation program is in progress (for example, the Found New Hardware
wizard).
7. If your system is running Microsoft Terminal Server, change the Terminal Server from Execution
mode to Installation mode.
Table 2lists the information you need before installing the HP MPIO EVA DSM.
HP MPIO Full Featured DSM for EVA4x00/6x00/8x00 family of Disk Arrays 3.00.00 11

Table 2 Pre-installation checklist
Task
Check the contents of the HP MPIO EVA DSM kit and the Fibre Channel hardware to make sure
nothing is missing. If you are missing any component, contact your account representative, or call
the HP Customer Service hotline at [phone].
Obtain and review the most current versions of the following documents:
•HP MPIO Full Featured DSM for EVA4x00/6x00/8x00 family of Disk Arrays release notes
•Installation and configuration information for your system, available at the following web site:
http://www.hp.com/country/us/eng/prodserv/storage.html
•Supported SAN topologies for HP MPIO EVA DSM, as defined and described in the
HP StorageWorks SAN design reference guide available at the following web site:
http://h18006.www1.hp.com/products/storageworks/san/documentation.html
CAUTION:
Installing HP MPIO EVA DSM when the Terminal Server is in execution mode may have adverse
effects on other software products. For detailed information, see the Microsoft web site:
http://support.microsoft.com/default.aspx?scid=kb;en-us;186612
Installing HP MPIO EVA DSM
You can install HP MPIO EVA DSM on a stand-alone system or a cluster configuration. The installation
procedure depends on the current configuration of your system.
This section describes how to install HP MPIO EVA DSM on the following configurations:
• Installing HP MPIO EVA DSM on stand-alone systems
• Installing HP MPIO EVA DSM on cluster configurations
Installing HP MPIO EVA DSM on stand-alone systems
You can install this software prior to attaching the hardware. To install the HP MPIO EVA DSM on a
stand-alone system, complete the steps below:
1. Complete the pre-installation checklist (Table 2) and the pre-installation procedure.
2. Ensure that only a single path is connected to the storage devices.
3. Configure the storage sets.
4. Run Launch.exe from the installation location.
5. In the launch window, click Install HP MPIO Full Featured DSM for EVA4x00/6x00/8x00 family
of Disk Arrays.
6. Follow the on-screen instructions to complete the installation.
7. Restart the server.
8. Add the redundant paths to the storage devices.
NOTE:
For Windows Server core 2008 – Server Core (x86 and x64), you can run Launch.exe from the
installation location, using the command prompt.
12 Installing the HP MPIO Full Featured DSM for EVA4x00/6x00/8x00 family of Disk Arrays

Installing HP MPIO EVA DSM on cluster configurations
To install HP MPIO EVA DSM on each member of a cluster configuration, complete the steps below:
NOTE:
In a cluster configuration, HP MPIO EVA DSM must be installed on one node at a time for all nodes of
the cluster.
1. Complete the pre-installation checklist (Table 2) and the pre-installation procedure.
2. Using Cluster Administrator:
a. Move all cluster resources owned by the current node to another node in the cluster.
b. Pause the current cluster node.
c. Disable failback for all groups containing resources managed by the current node.
3. Install HP MPIO EVA DSM on the current node by following step 2–9 from the procedure
Installing HP MPIO EVA DSM on stand-alone systems.
4. Using Cluster Administrator, resume the current cluster node.
NOTE:
Repeat steps 2–4 for all nodes in the cluster.
5. Using Cluster Administrator:
a. Restore failback for all groups containing resources as needed.
b. Redistribute cluster resources as desired.
Upgrading HP MPIO EVA DSM
You can upgrade HP MPIO EVA DSM from an existing version to the current version on a stand-alone
system or cluster configuration.
This section describes how to upgrade HP MPIO EVA DSM on the following configurations:
• Upgrading HP MPIO EVA DSM on stand-alone systems
• UpgradingHPMPIOEVADSMonclusterconfigurations
Upgrading HP MPIO EVA DSM on stand-alone systems
To upgrade HP MPIO EVA DSM from a previous version on stand-alone systems, complete the steps below:
1. Complete the pre-installation checklist (Table 2) and the pre-installation procedure.
2. Run Launch.exe from the installation location.
3. In the launch window, click Install HP MPIO Full Featured DSM for EVA4x00/6x00/8x00 family
of Disk Arrays.
4. Select the upgrade option.
5. Follow the on-screen instructions to complete the upgrade.
6. Restart the server.
Upgrading HP MPIO EVA DSM on cluster configurations
To upgrade HP MPIO EVA DSM from a previous version on each member of a cluster configuration,
complete the steps below:
HP MPIO Full Featured DSM for EVA4x00/6x00/8x00 family of Disk Arrays 3.00.00 13

NOTE:
In a cluster configuration, HP MPIO EVA DSM must be upgraded on one node at a time for all nodes in
the cluster.
1. Complete the pre-installation checklist (Table 2) and the pre-installation procedure.
2. Using Cluster Administrator:
a. Move all cluster resources owned by the current node to another node in the cluster.
b. Pause the current cluster node.
c. Disable failback for all groups containing resources managed by the current node.
3. Upgrade HP MPIO EVA DSM on the current node by following steps 2–6 from the procedure
Upgrading HP MPIO EVA DSM on stand-alone systems.
4. Using Cluster Administrator, resume the current cluster node.
NOTE:
Repeat steps 2–4 for all nodes in the cluster.
5. Using Cluster Administrator:
a. Restore failback for all groups containing resources as needed.
b. Redistribute cluster resources as desired.
Migrating from Windows Server 2003 to Windows Server
2008 with HP MPIO EVA DSM
To migrate from Windows Server 2003 to Windows Server 2008 with HP MPIO EVA DSM, complete
the steps below:
1. Back up all user data.
2. Install or Upgrade to HP MPIO EVA DSM 3.00.00, see Chapter 1
3. Upgrade to Windows Server 2008.
4. Double-click the batch file (depending on your operating system):
• For Windows Server 2008 x86:
<Target_Dir>\x86\Win2k8Upgrade.bat
•ForWindowsServer2008IA64:
<Target_Dir>\ia64\Win2k8Upgrade.bat
• For Windows Server 2008 x64:
<Target_Dir>\amd64\Win2k8Upgrade.bat
NOTE:
To upgrade cluster configuration in Windows Server 2003 to Windows Server 2008, see
http://support.microsoft.com/kb/935197
Removing HP MPIO EVA DSM
To remove the HP MPIO EVA DSM, you must reconfigure the SAN and reboot your server.
14 Installing the HP MPIO Full Featured DSM for EVA4x00/6x00/8x00 family of Disk Arrays

CAUTION:
Removing multipathing software from a multipath hardware configuration can cause data loss or
corruption. You must disconnect the server from the multipath storage or eliminate all but one path to
that storage from the server prior to removing the HP MPIO EVA DSM.
To remove HP MPIO EVA DSM, complete the steps below:
1. Back up all user data on multipath storage.
2. If possible, disconnect the storage from the server. If it is necessary to maintain single-path
connections from the server to the storage (as in the case of servers that boot from a SAN device),
use the following guidelines:
• If it is a one-host/one-storage array, HP recommends removing redundant cable connections.
• If the storage continues to be accessed by other servers still in multipath mode and by this
server in single-path mode and it is on an EVA system, use switch zoning to establish the
single connection (path) from the server.
NOTE:
Make sure you perform step 1 and step 2 before proceeding further.
3. Select Start >Settings >Control Panel >Add or Remove Programs.
4. Select HP MPIO Full Featured DSM for EVA4x00/6x00/8x00 family of Disk Arrays from the Remove
Program dropdown list.
5. Click Remove and follow the on-screen instructions.
The system displays a cautionary statement advising of the potential data loss or corruption that may
result from removing this software.
6. Close theAdd/Remove Programs window.
NOTE:
The LUNs maybeinaccessibleatthistime.
7. Reboot the system.
NOTE:
For Windows Server 2008 – Server Core, go to the installation location from the command prompt and
run Launch.exe. Select Remove > Remove all installed components, to remove HP MPIO EVA DSM.
Using silent installation
Silent installation can be run from the installation location on your computer or from a network drive. It
installs the HP MPIO EVA DSM with little intervention. Silent installation is useful if you are installing the
software on a large number of servers that require software installation.
This section describes the following:
•Insta
lling HP MPIO EVA DSM
• Upgrading HP MPIO EVA DSM
•RemovingHPMPIOEVADSM
•Crea
ting response files for silent mode operations
Syntax:
HP MPIO Full Featured DSM for EVA4x00/6x00/8x00 family of Disk Arrays 3.00.00 15

<install drive>:\MPInstall\setup.exe /s /f1"C:\setup.iss" /f2"C:\MPSInstallLog.txt"
The <install drive> refers to the drive which contains the installation media.
The setup.iss is the response file from which information is taken for silent installation.
The MPSInstallLog.txt file records information about the silent installation.
The ResponseResult section of the MPSInstallLog.txt log file displays the result code, indicating
whether or not the silent installation succeeded. An integer value is assigned to the ResultCode
keyname in the ResponseResult section.
Following are the list of common return values along with their descriptions in the ResultCode key:
Result Code Description
0Success
–1 General error
–3 Required data not found in the setup.iss file
–4 Not enough memory available
–5 File does not exist
–6 Cannot write to the response file
–7 Unable to writetothelogfile
–8 Invalid path to the InstallShield Silent response (.iss)file
–51 Cannot create the specified folder
–52 Cannot access the specified file or folder
NOTE:
The C: in /f1C: and /f2C: refers to a local drive on the system or a network drive which is used
to obtain the response file and write the MPSInstallLog.txt (provided there is write permission
in the directory).
For 32 bit systems:
<Default_Target_Dir> = C:\Program Files\Hewlett-Packard\HP MPIO DSM\EVA
DSM
For 64 bit systems:
<Default_Target_Dir> = C:\Program Files (x86)\Hewlett-Packard\HP MPIO
DSM\EVA DSM
<User_Target_Dir> = is a directory on the system on which the new installation is to be done or
the directoryofanexistinginstallation.
You must enclose the paths to the response file and the log file, which records the information about
the silent installation, in quotes ("").
Installing HP MPIO EVA DSM
To perform a silent installation of HP MPIO EVA DSM, complete the steps below:
1. Make a copy of the new.iss file in the installation kit.
2. Rename this copy of the file as setup.iss
3. Choose one of the following options:
• To install into the default directory for 64 bit systems, in lines 27 and 32 of the setup.iss
file, replace C:\Program Files\Hewlett-Packard\HP MPIO DSM\EVA DSM with
C:\Program Files (x86)\Hewlett-Packard\HP MPIO DSM\EVA DSM.
16 Installing the HP MPIO Full Featured DSM for EVA4x00/6x00/8x00 family of Disk Arrays

• To install into the user specified directory for both 32 and 64 bit systems, in lines 27 and
32 of the setup.iss file, replace szDir = <Default_Target_Dir> with szDir =
<User_Target_Dir>.
4. Choose one of the following options:
• To install the Microsoft MPIO Framework component along with the DSM component, use the
renamed default setup.iss file.
• To install only the DSM component (when the Microsoft MPIO Framework already exists on
your system), edit the renamed default setup.iss file as follows:
a. In line 34, replace Component-count=2 with Component-count=1.
b. Remove line 35.
c. In line 36, replace Component-1=DSM with Component-0=DSM.
5. If you want to avoid the automatic reboot feature, edit the setup.iss file as follows:
a. In line 50, replace Result=6 with Result=1.
b. In line 51, replace BootOption=3 with BootOption=0.
Upgrading HP MPIO EVA DSM
To upgrade from a previous version of HP MPIO EVA DSM to the current version, complete the steps below:
1. Make a copy of the update.iss file in the installation kit.
2. Rename this copy of the file as setup.iss
3. Choose one of the following options:
• To upgrade the Microsoft MPIO Framework component along with the DSM component,
use the renamed default setup.iss file.
• To upgrade only the DSM component (when the Microsoft MPIO Framework already exists
on your system), edit the renamed default setup.iss file as follows:
a. In line 23, replace Component-count=2 with Component-count=1.
b. Remove line 24.
c. In line 25, replace Component-1=DSM with Component-0=DSM.
4. If you want to avoid the automatic reboot feature, edit the setup.iss file as follows:
a. In line 39, replace Result=6 with Result=1.
b. In line 40, replace BootOption=3 with BootOption=0.
Removing HP MPIO EVA DSM
To remove HP MPIO EVA DSM, complete the steps below:
1. Make a copy of the uninstall.iss file in the installation kit.
2. Rename this copy of the file as setup.iss
3. If you want to avoid the automatic reboot feature, edit the renamed setup.iss file as follows:
a. In line 28, replace Result=6 with Result=1.
b. In line 29, replace BootOption=3 with BootOption=0.
Creating response files for silent mode operations
The package contains the following response files (.iss files): new.iss,uninstall.iss and
update.iss that are used for silent mode installation, uninstallation and update respectively. In addition
to these, you can create your own customized response files for operations (such as modify/repair) with
different combinations of the components selected/unselected.
Customized response files can be created by running the setup.exe in the record mode on one
of the systems. This response file can then be used for doing the same silent mode operation across
multiple systems.
To create response file, complete the following steps:
HP MPIO Full Featured DSM for EVA4x00/6x00/8x00 family of Disk Arrays 3.00.00 17

1. At the command prompt, type the following command: <CMD> setup.exe /r,where/r
option enables the record mode.
2. This will result in the GUI installation to run in the record mode. Select the responses in each
screen and run through the installation.
NOTE:
When selecting the response on each screen, do not click the BACK button, and modify the selection.
The response file will have to be generated again in such a case.
3. The response file is created at the following location: %WINDDIR%\setup.iss,where,
%WINDIR% is the Windows installation directory.
4. Use this setup.iss file to perform the same silent mode operation on multiple systems across
thesameplatform.
Setting up boot from SAN
HP MPIO EVA DSM can be set up to boot externally from a SAN that uses HP StorageWorks HBAs and
RAID arrays. Booting externally offers the following advantages:
•Optional elimination of server-based internal boot devices
•Decreased downtime in the event of a server failure
Booting from a SAN requires specific setup procedures based on the specificsoftwaresolutions,HBA
firmware, and boot BIOS versions. See the following documents for detailed information about booting
from a SAN:
•HP StorageWorks Booting 32-bit Windows systems and Windows Server x64 Edition
systems from a Storage Area Network application notes, available at this web site:
http://h18006.www1.hp.com/products/storageworks/san/documentation.html
•HP StorageWorks Booting Itanium 64-bit Windows Systems from a Storage Area Network
application notes, available at this web site: http://h18006.www1.hp.com/products/
storageworks/san/documentation.html
18 Installing the HP MPIO Full Featured DSM for EVA4x00/6x00/8x00 family of Disk Arrays

2 Support for load balancing in
Failover Cluster Server environment
for Windows Server 2008
The load balancing for the cluster devices is enabled by default and cannot be turned OFF.
• Recovering inaccessible disk devices
Recovering inaccessible disk devices
If there is a stray reservation on a disk device, the device becomes inaccessible to the host systems
connected to it. This is because the strong reservation type (persistent reservations) supports load
balancing in clusters.
You can use the persistent reservations clear utility that comes with the HP MPIO EVA DSM package
to remove the stray reservations. For more information on how to use this utility, see HP MPIO EVA
DSM persistent reservations clear utility.
HP MPIO Full Featured DSM for EVA4x00/6x00/8x00 family of Disk Arrays 3.00.00 19

20 Support for load balancing in Failover Cluster Server environment for Windows Server 2008