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HP XP P9500 Hitachi Dynamic Link Manager Software User Guide for VMWare (HIT52 - Page 32

Path Status Transition, The Online Path Statuses

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HDLM uses the same algorithms to select the path that will be used next, regardless of whether automatic or manual path switching is used. When using the Hitachi AMS/WMS series, HDLM will select the next path to be used first from among the online owner paths, and then from the online nonowner paths. When the Universal Storage Platform V/VM, Virtual Storage Platform, Hitachi AMS2000 series, or Hitachi SMS is being used, all the paths that access the same LU as the path that is currently being used are candidates for the switching destination path. Executing the online operation places the offline path online. For details on the online operation, see online (Places Paths Online) on page 6-11. After the path status is changed to online, HDLM selects the path to use in the same way as for automatic path switching. When the Hitachi AMS/WMS series is being used, HDLM selects the path to use from online owner paths, and then from online non-owner paths. When the Universal Storage Platform V/ VM, Virtual Storage Platform, Hitachi AMS2000 Series, or Hitachi SMS is being used, because all the paths are owner paths, the path to use is not switched even if you change the path status to online. Path Status Transition Of the online and offline statuses described in Performing Failovers and Failbacks Using Path Switching on page 2-11, the offline status is further divided into two sub-statuses. Each status is described below, categorized according to whether it is an online or offline status. The Online Path Statuses The online path statuses are as follows: • Online I/Os can be issued normally. The Offline Path Statuses The offline path statuses are as follows: • Offline(C) The status in which I/O cannot be issued because the offline operation was executed. For details on the offline operation, see offline (Places Paths Offline) on page 6-7. The (C) indicates the command attribute, which indicates that the path was placed offline by using the command. • Offline(E) The status indicating that an I/O could not be issued on a given path, because an error occurred on the path. The (E) in Offline(E) indicates the error attribute, which indicates that an error occurred in the path. 2-14 HDLM Functions 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

HDLM uses the same algorithms to select the path that will be used next,

regardless of whether automatic or manual path switching is used.

When using the Hitachi AMS/WMS series, HDLM will select the next path to be

used first from among the online owner paths, and then from the online non-

owner paths. When the Universal Storage Platform V/VM, Virtual Storage

Platform, Hitachi AMS2000 series, or Hitachi SMS is being used, all the paths

that access the same LU as the path that is currently being used are

candidates for the switching destination path.

Executing the

online

operation places the offline path online. For details on

the

online

operation, see

online (Places Paths Online) on page

. After

the path status is changed to online, HDLM selects the path to use in the

same way as for automatic path switching. When the Hitachi AMS/WMS series

is being used, HDLM selects the path to use from online owner paths, and

then from online non-owner paths. When the Universal Storage Platform V/

VM, Virtual Storage Platform, Hitachi AMS2000 Series, or Hitachi SMS is

being used, because all the paths are owner paths, the path to use is not

switched even if you change the path status to online.

Path Status Transition

Of the online and offline statuses described in

Performing Failovers and

Failbacks Using Path Switching on page

, the offline status is further

divided into two sub-statuses. Each status is described below, categorized

according to whether it is an online or offline status.

The Online Path Statuses

The online path statuses are as follows:

•

Online

I/Os can be issued normally.

The Offline Path Statuses

The offline path statuses are as follows:

•

Offline(C)

The status in which I/O cannot be issued because the

offline

operation

was executed. For details on the

offline

operation, see

offline (Places

Paths Offline) on page

The (C) indicates the command attribute, which indicates that the path

was placed offline by using the command.

•

Offline(E)

The status indicating that an I/O could not be issued on a given path,

because an error occurred on the path.

The (E) in Offline(E) indicates the error attribute, which indicates that an

error occurred in the path.

2-14

HDLM Functions

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