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Using the Multipath I/O Component, Introduction to Multipath I/O DSM

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5 Using the Multipath I/O Component The Dell EqualLogic Multipath I/O (MPIO) DSM (Device Specific Module) enables you to configure redundant network paths from a Windows computer to PS Series volumes for high availability and high-performance SAN data traffic. Topics: • Introduction to Multipath I/O DSM • Prerequisites for Configuring Multipath I/O DSM • Requirements for Multipath I/O • Configure Multipath I/O Between a Computer and a Group • View MPIO Sessions • Set the MPIO Load-Balancing Policy • EqualLogic MPIO Configuration Tool Introduction to Multipath I/O DSM The Dell EqualLogic MPIO DSM coordinates activity between the MPIO drivers and PS Series group storage, maximizing the capabilities of both the operating system and the iSCSI SAN. The MPIO component works with the iSCSI initiator and MPIO driver to improve both reliability and performance. The component consists of a kernel driver (eqldsm.sys) and a user mode service (EHCMservice.exe). If the Host Integration Kit installation included the option to import EqualLogic volumes to a PowerStore array, the MPIO component consists of a kernel driver (dcdsm.sys) and user mode services (EHCMservice.exe and DC-HAService.exe)." When you install the MPIO DSM on a Windows operating system, it establishes and manages multiple I/O data paths to the same iSCSI target (a PS Series volume). If a fatal path failure occurs, the failure is quickly detected and I/O transparently fails over to a functioning path. The MPIO DSM recognizes and responds to a variety of network errors, device errors, and timeout conditions. The MPIO DSM provides the following features: • Automatic connection management • Increased bandwidth • Reduced network latency • Automatic path failure detection and failover to a functioning path • Automatic load balancing across paths • Support for multiple connections to a single iSCSI target (volume) • Support for a variety of iSCSI initiators • Per-pool connection throttling The following figure shows a typical multipath I/O configuration. Using the Multipath I/O Component 35

Section	Page
Dell EqualLogic Host Integration Tools for Microsoft Edition Version 5.3 Installation and User's Guide	3
About This Guide	6
Revision History	6
Audience	6
Support Resources	6
Download the Installation Kit	6
Related Documentation	6
Dell Online Services	6
Contacting Dell	7
Introduction to Host Integration Tools	8
Host Integration Tools Components	8
SMP Support	9
SMP Configuration	9
SCVMM Support	9
Configure SCVMM	9
Supported SCVMM Operations	10
Supported Applications	10
Microsoft Exchange Server	10
Microsoft SQL Server	10
Microsoft Hyper-V	11
SharePoint	11
Installation	12
Obtain the Installation Kit	12
Download the Installation Kit	12
Administrative Installation Using Active Directory	12
Installation Considerations	13
Install Host Integration Tools for Microsoft	13
Update an Installation	14
Uninstall HIT or a Component	14
Install HIT/Microsoft on a Windows Server 2012 R2 Core Machine	14
Install HIT on a Windows Server 2012 R2 Core Cluster	15
About Remote Host Installations	15
Install HIT on Remote Hosts With the Add Hosts Wizard	15
Procedure for Installing HIT on Remote Hosts with the Add Hosts Wizard	16
Install HIT on Remote Hosts Using PowerShell Scripts	16
Syntax for PowerShell Remote Host Installation	17
Procedure for Installing HIT on Remote Hosts With PowerShell	18
Install HIT on a Failover Cluster	18
Specify the ASM/ME Backup Document Directory	19
Change the Login Account for ASM/ME Services (EQLReqService and EqlASMAgent)	19
Join a Computer into a Failover Cluster	19
About Silent Installations	19
Support for a Silent Installation	20
Syntax	20
Perform a Silent Installation	20
Perform a Silent Uninstallation	21
Create a Log File During Silent Mode	21
Using HIT With a SharePoint Farm	21
Specify Index File Locations When Installing SharePoint	21
Modify Index File Locations in an Existing SharePoint Farm	22
Change the Default Index File Location Using PowerShell cmdlets	23
Change Index File Locations Using Central Administration	23
Change Administration Component Index File Location	23
Change the SPSearch Index File Location	23
Best Practices for SharePoint	24
Remote Setup Wizard	25
PS Series Group Requirements for Using RSW	25
Windows System Requirements for Using RSW	25
Launch RSW on the Host	25
Launch RSW From ASM/ME	26
Initialize a PS Series Array Using RSW	26
Search for a PS Series Array Using RSW	26
Information Required for Initializing a PS Series Array	26
Initialize an Array and Create a PS Series Group	27
Initialize an Array and Add It to an Existing Group	28
Troubleshoot RSW	28
Remote Setup Command Line Utility	29
General Command Syntax for the RSWCLI	29
Getting Help on Commands	29
Using RSWCLI Commands	30
Discover a PS Series Array	30
Initialize a PS Series Array	30
List or Modify MPIO Settings	31
List Included and Excluded Subnets for MPIO	32
Include a Subnet or Adapter for Use by MPIO	33
Exclude a Subnet or Adapter From Use By MPIO	33
Using the Multipath I/O Component	35
Introduction to Multipath I/O DSM	35
Determining the Number of iSCSI Sessions for a Volume Slice	36
Prerequisites for Configuring Multipath I/O DSM	37
Requirements for Multipath I/O	37
Configure Multipath I/O Between a Computer and a Group	38
Log In to a Volume With Multipath I/O	38
Log Off a Volume With Multipath I/O on Variants of Windows Operating Systems	39
View MPIO Sessions	39
Set the MPIO Load-Balancing Policy	41
On Other Operating Systems	41
EqualLogic MPIO Configuration Tool	41
Use the VDS Provider	43
VDS Provider Requirements	43
VDS Provider Guidelines and Restrictions	43
Simple Target and LUN Naming	43
Import VSS Snapshots	44
Adjustments After Access Control Modifications	44
Create a Volume Using Storage Manager for SANs	44
Start Storage Manager for SANs	44
Use SCVMM With the Dell EqualLogic SMP	46
Install the Dell EqualLogic Storage Management Provider	46
Configure the Dell EqualLogic Storage Management Provider	46
Create a Classification for Dell EqualLogic Storage Resources	47
Import the SMP Through the SCVMM GUI	47
Configure PS Series Groups	49
Configure Group Access on Managed Hosts and Clusters	50
Configure Storage for VM Rapid Provisioning	51
Create a VM Template for the Library Share	52
Create a VM Template From a VHD	53
Migrate the Rapid-Provisioned VMs	55
Migrate Storage of a Deployed VM to Another Location	56
Troubleshoot SCVMM Issues	57
Supported SMP PowerShell Cmdlets	57
Use the HPC iSCSI Provider	59
About the HPC iSCSI Provider Installation	59
Configure the PS Series Array	59
HPC iSCSI Provider Settings	59
Tools and Utilities	61
EqlXcp Utility	61
EqlXcp Utility Restrictions	61
Run the EqlXcp Utility	61
EqlLog Utility	62
EqlLog Utility Overview	62
Run the EqlLog Utility	62
EqlLog Command Line Options	62
Trace Log Daemon	63
EqlRethin Utility	63
Run the EqlRethin Utility	63
Index	65
Special Characters	65
A	65
B	65
C	65
D	65
E	65
F	65
G	65
H	66
I	66
K	66
L	66
M	66
N	67
P	67
R	67
S	68
T	68
U	68
V	69
W	69

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Using the Multipath I/O Component

The Dell EqualLogic Multipath I/O (MPIO) DSM (Device Specific Module) enables you to configure redundant network paths from a

Windows computer to PS Series volumes for high availability and high-performance SAN data traffic.

Topics:

•

Introduction to Multipath I/O DSM

•

Prerequisites for Configuring Multipath I/O DSM

•

Requirements for Multipath I/O

•

Configure Multipath I/O Between a Computer and a Group

•

View MPIO Sessions

•

Set the MPIO Load-Balancing Policy

•

EqualLogic MPIO Configuration Tool

Introduction to Multipath I/O DSM

The Dell EqualLogic MPIO DSM coordinates activity between the MPIO drivers and PS Series group storage, maximizing the capabilities of

both the operating system and the iSCSI SAN.

The MPIO component works with the iSCSI initiator and MPIO driver to improve both reliability and performance. The component consists

of a kernel driver (

eqldsm.sys

) and a user mode service (

EHCMservice.exe

If the Host Integration Kit installation included the option to import EqualLogic volumes to a PowerStore array, the MPIO component

consists of a kernel driver (

dcdsm.sys

) and user mode services (

EHCMservice.exe

and

DC-HAService

.exe)."

When you install the MPIO DSM on a Windows operating system, it establishes and manages multiple I/O data paths to the same iSCSI

target (a PS Series volume). If a fatal path failure occurs, the failure is quickly detected and I/O transparently fails over to a functioning

path. The MPIO DSM recognizes and responds to a variety of network errors, device errors, and timeout conditions.

The MPIO DSM provides the following features:

•

Automatic connection management

•

Increased bandwidth

•

Reduced network latency

•

Automatic path failure detection and failover to a functioning path

•

Automatic load balancing across paths

•

Support for multiple connections to a single iSCSI target (volume)

•

Support for a variety of iSCSI initiators

•

Per-pool connection throttling

The following figure shows a typical multipath I/O configuration.

Using the Multipath I/O Component