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Parameters, Table 6-2 Default and Recommended Values

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Parameters To Set the Host Operating Environment Table 6-2 Default and Recommended Values on page 6-16 shows the defaults and recommended values for each setting. If you change the value of the set operation, the new value takes effect immediately. Table 6-2 Default and Recommended Values Item name Default value Recommended value Load balancing The Extended Least I/Os algorithm is used. Intermittent error off monitoring The recommended algorithm depends on the operating environment. on -lb on -lbtype {exrr|exlio|exlbk|vmwmru|vmwrr} Specify the algorithm to be used for load balancing. exrr: The Extended Round Robin algorithm exlio: The Extended Least I/Os algorithm exlbk: The Extended Least Blocks algorithm vmwmru: The Most Recently Used algorithm (VMware) vmwrr: The Round Robin algorithm (VMware) -iem { on [-intvl error-monitoring-interval] [-iemnum number-oftimes-error-is-to-occur] | off } Enables or disables intermittent error monitoring. on: Enabled off: Disabled To prevent I/O performance from dropping when an intermittent error occurs, we recommend that you enable intermittent error monitoring. If on is specified, be sure to also specify the intermittent error monitoring interval and the number of times that the error is to occur. The system assumes that an intermittent error is occurring if the specified number of times that the error is to occur is reached during the monitoring interval. A path that is assumed to have an intermittent error is excluded from automatic failbacks. Intermittent error monitoring is performed on each path. Intermittent error monitoring starts when a path is recovered from an error by performing an automatic failback. If you omit the intermittent error monitoring interval or the number of times that the error is to occur, each setting is specified as follows: ¢ When the intermittent error monitoring interval or the number of times that the error is to occur has not been specified before: The intermittent error monitoring interval is set to 30 minutes, and the number of times that the error is to occur is set to 3. ¢ When the intermittent error monitoring interval or the number of times that the error is to occur has been specified before: 6-16 Command Reference Hitachi Dynamic Link Manager User Guide (for VMware(R))

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

Parameters

To Set the Host Operating Environment

Table 6-2 Default and Recommended Values on page

shows the

defaults and recommended values for each setting. If you change the value

of the

set

operation, the new value takes effect immediately.

Table 6-2 Default and Recommended Values

Item name

Default value

Recommended value

Load balancing

The Extended Least I/Os

algorithm is used.

The recommended algorithm

depends on the operating

environment.

Intermittent error

monitoring

off

-lb on -lbtype {exrr|exlio|exlbk|vmwmru|vmwrr}

Specify the algorithm to be used for load balancing.

exrr

: The Extended Round Robin algorithm

exlio

: The Extended Least I/Os algorithm

exlbk

: The Extended Least Blocks algorithm

vmwmru

: The Most Recently Used algorithm (VMware)

vmwrr

: The Round Robin algorithm (VMware)

-iem { on [-intvl

error-monitoring-interval

] [-iemnum

number-of-

times-error-is-to-occur

] | off }

Enables or disables intermittent error monitoring.

: Enabled

off

: Disabled

To prevent I/O performance from dropping when an intermittent error

occurs, we recommend that you enable intermittent error monitoring. If

is specified, be sure to also specify the intermittent error monitoring

interval and the number of times that the error is to occur. The system

assumes that an intermittent error is occurring if the specified number of

times that the error is to occur is reached during the monitoring interval.

A path that is assumed to have an intermittent error is excluded from

automatic failbacks. Intermittent error monitoring is performed on each

path. Intermittent error monitoring starts when a path is recovered from

an error by performing an automatic failback.

If you omit the intermittent error monitoring interval or the number of

times that the error is to occur, each setting is specified as follows:

When the intermittent error monitoring interval or the number of

times that the error is to occur has not been specified before:

The intermittent error monitoring interval is set to 30 minutes, and

the number of times that the error is to occur is set to 3.

When the intermittent error monitoring interval or the number of

times that the error is to occur has been specified before:

6-16

Command Reference

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