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2. HDLM Functions
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2.3 LU Configuration
After you have properly installed HDLM, the LU configuration will change as follows:
Before the installation of HDLM:
The host recognizes that a SCSI device is connected to each path.
Thus, a single LU in the storage system is recognized as though there are as many
LUs as there are paths.
After the installation of HDLM:
An HDLM device corresponding one-to-one with an LU in the storage system is
created at a level higher than the SCSI device.
#
Thus, from the host, LUs in the storage system are also recognized as a single LU
regardless of the number of paths.
#
In addition to the one that indicates the entire LU, a logical device file for the
HDLM device is created for each partition.
An LU recognized by a host after HDLM installation, is called a
host LU
(HLU). The
areas in a host LU that correspond to the Dev (partition) in a storage system LU are
called
host devices
(HDev).
On a system using HDLM, the logical device file for the HDLM device is used to
access the target LU instead of the logical device file for the SCSI device.
Figure 2-3: LU Configuration Recognized by the Host After HDLM Installation
shows the LU configuration recognized by the host after HDLM installation.
Summary of Contents for Dynamic Link Manager
Page 1: ...Hitachi Dynamic Link Manager Software User s Guide for Linux R 3000 3 F04 60 E ...
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Page 154: ...3 Creating an HDLM Environment 130 Figure 3 1 Flow of HDLM Environment Setup ...
Page 162: ...3 Creating an HDLM Environment 138 ...
Page 309: ...3 Creating an HDLM Environment 285 Figure 3 33 Example of Creating an ext2 File System ...
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Page 362: ...4 HDLM Operation 338 A Fibre Channel switch s zone setting is changed ...
Page 375: ...4 HDLM Operation 351 ...
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Page 549: ...8 Messages 525 HDLM driver filter component HDLM alert driver HDLM management target ...
Page 590: ...8 Messages 566 dd dd Maintenance information hexadecimal number Action None ...
Page 594: ...8 Messages 570 aa aa Name of file where error was detected Action Reinstall an HDLM ...
Page 713: ...8 Messages 689 utility see 7 2 DLMgetras Utility for Collecting HDLM Error Information ...
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