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HP XP P9500 Hitachi Dynamic Link Manager Software User Guide for VMWare (HIT52 - Page 125

The Extended Least I/Os algorithm

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Displayed item No summary displayed Summary displayed DNum# - IEP# - LB# - VmPSP# - VmRuntimeName# - VmState# - Description (4294967295). If the total I/O error count reaches the maximum value, it is reset, and the count is re-started from 0. To reset the IOErrors value to 0, execute the dlnkmgr command's clear operation. Executing the clear operation also clears the number of I/O operations (IO-Count) to 0. For details about the clear operation, see clear (Returns the Path Statistics to the Initial Value) on page 6-3. When Dev indicates an entire LU, 0 is displayed. The displayed paths are assumed to be in an intermittent error status and checked whether those paths are to be operated for automatic failbacks. One of the following values is displayed for each path: • -: Indicates that intermittent error monitoring is disabled or the path status is Offline(C). • A value of at least 0: Indicates the number of errors that occurred during intermittent error monitoring. • *: Indicates that an intermittent error occurred (automatic failback does not check the path). The algorithm being used for load balancing. • exrr: The Extended Round Robin algorithm • exlio: The Extended Least I/Os algorithm • exlbk: The Extended Least Blocks algorithm • vmwfixed: The Fixed algorithm (VMware) • vmwmru: The Most Recently Used algorithm (VMware) • vmwrr: The Round Robin algorithm (VMware) • unknown: An algorithm other than the above The PSP currently in effect. In path information fields, displays the path runtime information managed by VMware vSphere. The path status managed by VMware vSphere. • active: Online • standby: Online • off: Offline status caused by a command operation (Offline(C)) Command Reference Hitachi Dynamic Link Manager User Guide (for VMware(R)) 6-45

Section	Page
User Guide (for VMware(R))	1
Contents	3
Preface	9
Intended audience	10
Product version	10
Release notes	10
Document revision level	10
Document organization	10
Referenced documents	11
Document conventions	11
Convention for storage capacity values	13
Getting help	13
Comments	14
Overview of HDLM	15
What is HDLM?	16
HDLM Features	17
HDLM Functions	19
Devices Managed by HDLM	20
System Configuration	20
LU Configuration	21
Program Configuration	22
HDLM driver and NMP positions	23
Distributing a Load Using Load Balancing	24
Paths to Which Load Balancing Is Applied	26
Load Balancing Algorithms	27
Performing Failovers and Failbacks Using Path Switching	29
Automatic Path Switching	29
Manual Path Switching	31
Path Status Transition	32
Monitoring Intermittent Errors	34
Checking Intermittent Errors	34
Setting Up Intermittent Error Monitoring	34
Intermittent Error Monitoring Actions	35
When a User Changes the Intermittent Error Information	37
Detecting Errors by Using Path Health Checking	39
Error Management	39
Types of Collected Logs	40
Collecting Error Information Using the Utility for Collecting HDLM Error Information (DLMgetras)	41
Collecting Audit Log Data	41
Categories and Audit Events that HDLM Can Output to the Audit Log	43
Requirements for Outputting Audit Log Data	44
Destination and Filtering of Audit Log Data	45
Audit Log Data Formats	45
Creating an HDLM Environment	49
HDLM System Requirements	50
Hosts and OSs Supported by HDLM	50
Storage Systems Supported by HDLM	50
Memory and Disk Capacity Requirements	51
Number of Paths Supported in HDLM	51
Flow for Creating an HDLM Environment	52
HDLM Installation Types	52
Notes on Creating an HDLM Environment	52
Installing HDLM	53
Performing a New Installation of HDLM	53
Performing a Re-installation of HDLM	56
Checking the Path Configuration	56
Setting Up HDLM	57
Checking the Current Settings	57
Setting Up the HDLM Functions	58
Checking the Updated Settings	60
Setting Up Integrated Traces	61
Uninstalling HDLM	63
Preparations for HDLM Uninstallation	63
Uninstalling HDLM	64
HDLM Operation	67
HDLM Operations Using Commands	68
Notes on Using Commands	68
Viewing Path Information	68
Changing the Status of Paths	69
Viewing LU Information	70
Initializing Statistical Information for Paths	71
Viewing and Setting Up the Operating Environment	71
Viewing License Information	72
Updating the License	73
Viewing HDLM Version Information	73
Troubleshooting	75
Information Collected by the DLMgetras Utility for Collecting HDLM Error Information	76
Checking Error Information in Messages	76
What To Do for a Path Error	76
Examining the Messages	78
Obtain Path Information	78
Identifying the Error Path	78
Narrowing Down the Hardware That Might Have Caused the Error	78
Identifying the Error Location and Correcting any Hardware Error	78
Placing the Path Online	78
What To Do for a Program Error	79
Examining the Messages	79
Obtaining Program Information	79
What To Do for the Program Error	80
Contacting your HDLM Vendor or Maintenance Company	80
What To Do for Other Errors	80
Command Reference	81
Overview of the HDLM Command dlnkmgr	82
clear (Returns the Path Statistics to the Initial Value)	83
Format	83
Parameters	84
help (Displays the Operation Format)	85
Format	85
Parameter	85
offline (Places Paths Offline)	87
Format	88
Parameters	88
online (Places Paths Online)	91
Format	91
Parameters	92
set (Sets Up the Operating Environment)	95
Format	95
Parameters	96
view (Displays Information)	102
Format	102
Parameters (To display program information)	104
Utility Reference	129
The DLMgetras Utility for Collecting HDLM Error Information	130
Format	130
Parameters	130
List of Collected Error Information	131
Messages	135
Before Viewing the List of Messages	136
Format and Meaning of Message IDs	136
Terms Used in Messages and Message Explanations	136
KAPL01001 to KAPL02000	137
KAPL09001 to KAPL10000	157
KAPL10001 to KAPL11000	158
KAPL13001 to KAPL14000	163
KAPL15001 to KAPL16000	164
KAPL20001 to KAPL21000	165
KAPL21001 to KAPL22000	169
Acronyms and abbreviations	171
Glossary	177

Match case Limit results 1 per page

Displayed item

Description

No summary

displayed

Summary

displayed

(4294967295). If the total I/O error count

reaches the maximum value, it is reset, and the

count is re-started from 0. To reset the

IO-

Errors

value to 0, execute the

dlnkmgr

command's

clear

operation. Executing the

clear

operation also clears the number of I/O

operations (

IO-Count

) to 0. For details about the

clear

operation, see

clear (Returns the Path

Statistics to the Initial Value) on page

DNum

When Dev indicates an entire LU, 0 is displayed.

IEP

The displayed paths are assumed to be in an

intermittent error status and checked whether

those paths are to be operated for automatic

failbacks.

One of the following values is displayed for each

path:

•

: Indicates that intermittent error

monitoring is disabled or the path status is

Offline(C)

•

A value of at least 0: Indicates the number

of errors that occurred during intermittent

error monitoring.

•

: Indicates that an intermittent error

occurred (automatic failback does not check

the path).

The algorithm being used for load balancing.

•

exrr

: The Extended Round Robin algorithm

•

exlio

: The Extended Least I/Os algorithm

•

exlbk

: The Extended Least Blocks algorithm

•

vmwfixed

: The Fixed algorithm (VMware)

•

vmwmru

: The Most Recently Used algorithm

(VMware)

•

vmwrr

: The Round Robin algorithm

(VMware)

•

unknown

: An algorithm other than the above

VmPSP

The PSP currently in effect.

VmRuntimeName

In path information fields, displays the path

runtime information managed by VMware

vSphere.

VmState

The path status managed by VMware vSphere.

•

active

: Online

•

standby

: Online

•

off

: Offline status caused by a command

operation (

Offline(C)

)

Command Reference

6-45

Hitachi Dynamic Link Manager User Guide (for VMware(R))