Hitachi Dynamic Link Manager Software Users Guide for Windows (7.6)

Differences in the Drive Letters Displayed in Windows
Depending on the HDLM version, the Windows' drive letters that are
displayed when all paths connected to the LU have an error status differ as
follows:
• When the LU dynamic removal function is not used in HDLM 5.4
Drive letters are displayed for the disks that are displayed in My
Computer.
• When the LU dynamic removal function is used in HDLM 5.4, or 5.5 or
later, or when the function is not used in HDLM 5.5
Drive letters are not displayed for the disks that are displayed in My
Computer.
Differences in Default Values
Depending on the HDLM version, default values for various HDLM functions
differ as follows:
• Default value for path health checking
¢
In HDLM 04-00 or earlier: off
¢
In HDLM 05-00 or later: on. The checking interval is 30 minutes.
• Default value for error log file size
¢
In HDLM 5.4 or earlier: 1000 KB. Note that this item name in HDLM
5.4 or earlier is Log file size.
¢
In HDLM 5.4 or later: 9900 KB
• Default value for automatic failbacks
¢
In HDLM earlier than 6.0: off
¢
In HDLM 6.0 or later: on
• Default value for the load balancing algorithms
¢
In HDLM 6.0 or earlier: rr (Round Robin)
¢
In HDLM 6.0.1 or later: exlio (Extended Least I/Os)
¢
Also, the value of the load_balance_type key for the
following file has changed from rr to exlio: the sample file
sample_installhdlm.ini for the installation-information
settings file used by the installhdlm utility for
installing HDLM
Differences in the Load Balancing Function in an MSCS
Environment
HDLM 05-00 or earlier does not support the load balancing function in an
MSCS environment. Therefore, when you use HDLM 05-00 or earlier in an
Functional Differences Between Versions of HDLM
A-7
Hitachi Dynamic Link Manager User Guide for Windows
®