Hitachi Dynamic Link Manager Software Users Guide for AIX

occur in the -iemnum parameter. When these parameters are omitted, the
default values of 210 and 3 are used, respectively.
Setting Up Dynamic I/O Path Control
To prevent degrading of I/O performance, this function dynamically switches
the output controllers for HDLM, following the switching of controllers
performed by the storage system.
The dynamic I/O path control function can be set for each storage system or
LU. The checking interval for reviewing the switching status information can
also be set in order to properly follow the switching of controllers performed
by the storage system,
The following is an example of setting the dynamic I/O path control function:
# /usr/DynamicLinkManager/bin/dlnkmgr set -dpc on -pathid 000001 -lu
# /usr/DynamicLinkManager/bin/dlnkmgr set -dpcintvl 10
Specify "on" to enable the dynamic I/O path control function, or "off" to
disable the function. For the -pathid parameter, specify an LU, or the ID of a
path connected to the storage system. For the -dpcintvl parameter, specify
the checking interval (in minutes) for reviewing the information about the
switching of controllers performed by the storage system.
Setting the Error Log Collection Level
The error log (the HDLM manager log (dlmmgrn.log (n indicates a file
number from 1 to 16)) collection level can be set.
The following table lists and describes the values for the error log collection
level setting.
Table 3-13 Values for the Error Log Collection Level Setting
Value Description
0 No error logs are collected.
1 All information for errors of the "Error" level or higher is
collected.
2 All information for errors of the "Warning" level or higher is
collected.
3 All information for errors of the "Information" level or
higher is collected.
4 All information for errors of the "Information" level or
higher (including maintenance information) is collected.
If an error occurs, you might have to set the error log collection level to 1 or
higher to collect any log information.
The higher this value is set, the more information that will be output. As the
amount of log information to be output increases, it will take less time to
overwrite the old error log information with the new information.
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Creating an HDLM Environment
Hitachi Dynamic Link Manager (for AIX) User Guide