HiCommand Dynamic Link Manager User's Guide (for Windows(R))

2.12 Cluster support

HDLM is also available for cluster configurations.

Table 2-9 Cluster software supported by HDLM lists the cluster software supported by HDLM.

Table 2-9 Cluster software supported by HDLM

OS	Cluster software	Thunder 9200/9500V Series, Lightning 9900/9900V Series, TagmaStore, and Universal Storage Platform V	EMC DMX series	EMC CX series	HP EVA series
Windows 2000 Server	MSCS	Y	--	--	--
	Oracle 9i RAC version 9.2.0.1.0	Y	--	--	--
	Oracle RAC 10g version 10.1.0.2.0	Y	--	--	--
Windows Server 2003 (IA32)#	MSCS	Y	Y	Y	Y
	VCS 4.1, 4.2, 4.3	Y	--	--	--
	Oracle RAC 10g version 10.1.0.2.0, version 10.1.0.3.0, version 10.1.0.4.0	Y	--	--	--
Windows Server 2003 (IPF)#	MSCS	Y	Y	Y	Y
Windows Server 2003 (x64)	MSCS	Y	--	--	--

Legend:

Y: Can be used.

--: Cannot be used.

#

Only the following OSs can manage the EMC DMX series, EMC CX series, and HP EVA series:

- Windows Server 2003 (IA32) SP1 or later

- Windows Server 2003 (IPF) SP1 or later

When load balancing is supported in a cluster configuration, HDLM uses a path of the active host to access an LU.

For example, in Figure 2-16 Path switching in a cluster configuration, when HDLM uses a path that passes through the path (A) of the active host to access a device within the LU, if the path is placed offline, HDLM switches to a path that passes through the path (B) of the active host to continue processing.

The trigger for switching hosts depends on the cluster software.

Figure 2-16 Path switching in a cluster configuration

Note

• When you use HDLM in a cluster configuration, you must install the same version of HDLM on all the nodes that comprise the cluster. If different versions of HDLM are installed, the cluster system may not operate correctly. If the HDLM Version and Service Pack Version, which are displayed by executing the following command, are the same, the versions of HDLM are the same:
  
  >dlnkmgr view -sys -sfunc
  
  
• The Disk Reservation agent of the VCS is not supported.
• When a MSCS environment is created using the Thunder 9200 series or Thunder 9500V, perform the storage subsystem settings to enable the persistent reservation functionality. For details, see a list of the storage subsystem setting information in Hardware Notes provided with HDLM.

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