Chapter 11. Administration - Mappings Tab

11.1 Mappings tab

The Mappings tab contains the Topology pane and the Defined Mappings pane. In the

Topology pane, you can define the host groups, hosts, and host ports. The Topology pane

shows a tree structured view of the logical nodes related to storage partitions in the storage

subsystem. The Defined Mappings pane shows the mappings (logical drives) that are

associated with a selected host group or host in the Topology pane. You can also change the

mappings to grant logical drive access to host groups or hosts, and create storage partitions.

The overall process of defining the storage partitions is described in this chapter in the

following topics:

11.2, “Defining Host” on page 277

11.3, “Defining Storage Partitioning” on page 286

11.4, “Defining Host Group” on page 289

11.5, “Manage Host Port Identifiers” on page 290

11.6, “Define Additional Mapping” on page 291

11.7, “View Unassociated Ports” on page 293

11.8, “Move, Remove and Rename Host” on page 293

11.9, “Change Host Operating System” on page 294

11.10, “Change and Remove Mapping” on page 295

To start with mapping, select the Mappings tab in DS Storage Manger subsystem window. If

you have not defined any storage partitions yet, the Mapping Start-Up Help window (shown in

Figure 11-1) opens. The information in the window advises you to only create host groups if

your plan includes sharing logical volumes across hosts, normally a cluster.



Figure 11-1 Mappings Start-Up Help



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Figure 11-2 shows an example of the Mappings tab. The right side of the window lists all

mappings that are owned by the object you selected on the left side. If you highlight the

Storage Subsystem, you see a list of all defined mappings. If you highlight a specific host

group or host, only the associated mappings are listed.



Figure 11-2 Mappings tab in DS Subsystem Management window



In the following sections, we show how to configure the storage partitioning.

Note:

Before configuring the storage partitions, if you have your storage connected to a FC

switch, make sure to first define the SAN zones appropriately.

Perform a hardware rescan on each host that has to be mapped to the DS3500 storage

subsystem to reconfigure the FC or SAS devices (HBA) and allow the WWPN to be

presented in the Storage Manager.

Generally, configure only one host HBA per SAN zone along with one DS3500 storage

subsystem controller.



11.2 Defining Host

The Host can be defined as stand-alone server, or as a cluster member. Perform the following

steps to define host:

1. Right-click your Storage Subsystem icon, right-click the Default Group icon, or right-click

an existing Host Group. In the menu that appears, select Define  Host as shown in

Figure 11-3 on page 278. Even with no host group created, it is easier to create the hosts

first and then the host groups. In the Figure 11-3 on page 278 you can also see that all



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general configuration options for the whole Storage Subsystem are accessible from the

Mappings tab. These options are described in Chapter 8, “Administration - Subsystem

Management” on page 187.



Figure 11-3 Define Host menu



When Define  Host option is selected, you will be presented with a wizard for defining a

new host. You have to provide the following information during the process:

– Name of the new host

– Protocol attachment method:

•

•

•



SAS

FC (if FC daughter card installed)

iSCSI (if iSCSI daughter card installed)



– Host port identifiers with their Alias

– Host type (the operating system that runs on the host)

– Whether the host is going to participate in a cluster

– Host Group name if the host is defined as clustered

2. The first window of the wizard is an introduction. In the next window (Figure 11-4 on

page 279) you are asked to assign a Host name to the host being defined, and whether

you plan to use storage partitioning.



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Figure 11-4 Define Host wizard: specify Host name



3. If you only plan to attach a single host server, then you do not need storage partitioning.

But if you plan to group host environments together, or if clusters are sharing logical

drives, click Yes to create different hosts groups at a later time. Select Next to continue.

4. In the next window (Figure 11-5 on page 280), you need the attachment protocol to

specify the host interface type (SAS, FC, or iSCSI) and the HBA host port information

(host port identifier and Alias). Remember that the HBA host port identifier is the

world-wide port name of the particular HBA port. To make sure that you know what your

server’s HBA WWPN is, use the appropriate management tool for your HBA (for example

SANsurfer management tool for Qlogic HBA), or use Fabric Name Server in FC fabric

management tool, or you can note WWPN from BIOS during boot process of the server

where HBA is placed.



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Figure 11-5 Define Host: Interface type, known port identifier and Alias



– Select your interface type (SAS in our example)

– Select an active port already detected by the storage subsystem in the Known

unassociated host port identifier menu as shown in Figure 11-5, or type the world-wide

port name directly into the field, if the server is not connected or zoned yet, but you

already know its WWPN (see Figure 11-6 on page 281).



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Figure 11-6 Define Host: Interface type, new port identifier and Alias



– Type an Alias for the specified host port identifier and click Add.

– Repeat the same process until you define all the HBAs. Remember that if you define

only one HBA, the host can lose access if there is a problem with that data path. Select

Next after defining all the HBAs for given host.

5. The next window requires you to specify the host type (Figure 11-7 on page 282). This is

the operating system running on the host. It is vital that you select the appropriate host

type because the RDAC and ADT/AVT settings rely on this setting. In addition, this is the

part of the configuration where you configure the heterogeneous host support. Each

operating system expects slightly different settings and handles SCSI commands

differently. If you make a wrong choice, your operating system might not recognize LUNs

anymore or path failover might not work. Select a host type version that supports

clustering if you plan to configure the host as a cluster node.



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Figure 11-7 Define Host: Specify Host type



6. In the next step, you are asked whether the host is a part of a cluster (Figure 11-8).

Choose Yes if it will be clustered, or No, if it will be a stand-alone server. Click Next to

continue.



Figure 11-8 Define Host: Specify sharing (clustering)



7. (Optional) If the answer is Yes, then you need to specify a host group. The host group can

be either a new or an existing one. If you select an existing host group, hosts that are

already associated with that group are displayed in the right pane of this window. If you

enter a new name, as shown in Figure 11-9 on page 283, the new host group will be

created with this new host as a member. Select Next to continue.



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Figure 11-9 Define Host: Specify new Host Group



8. Finally, you have a chance to preview the new host definition (Figure 11-10 on page 284).

If all the selections are correct, click Finish to define the new host. Note that you can save

the host definition as a script file for SMcli by clicking the Save As Script button in the

upper right corner of this window. You can use this script command to easily change the

host definition for mapping copies of logical drives in high level scripts for disaster

recovery.



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Figure 11-10 Define Host: new Host definition Preview



9. After the process is completed, the new host (and the host group, if it was also defined) is

placed in the Default Group in the Topology tree (Figure 11-11). It will stay there until you

actually create a storage partition by assigning the logical drives to that host (or host

group).



Figure 11-11 Host defined



10.Repeat these steps to create more hosts and host groups.



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11.2.1 Adding a new Host to existing Host Group

You can decide to incorporate a new host to the host group, and make it work together with

the other host or hosts as a cluster. Remember that when you put the new host into the host

group, the new host can access all logical drives mapped to this host group immediately.

Perform the following steps to add Host to Host Group:

1. Define the new host by performing the steps shown in 11.2, “Defining Host” on page 277.

2. Specify the host type to be the same as other hosts in the target host group, and select

Yes - this host will share access to in the window shown in Figure 11-8 on page 282,

3. Incorporate the host into the existing host group where your other host or hosts are

already defined. Select Select existing host group as shown in Figure 11-12 and click

Next to finish.



Figure 11-12 Add Host to existing Host Group



After performing these steps, the Mappings tab appears as shown in Figure 11-13 on

page 286, showing the correct configuration for a cluster environment.



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:



Figure 11-13 Second Host Group added for clustering



11.3 Defining Storage Partitioning

Next we describe how to set a new storage partition definition for Host or Host Group that has

no logical drives mapped yet. You need to use the Additional Mapping menu to map a new

logical drive to a host or host group where logical drives are already mapped.

Creating a storage partition by assigning the logical drives to new hosts or host groups using

the following steps:

1. Right-click Default Group or any unmapped host or host group icon in the Topology tree

below the Default Group (Figure 11-14 on page 287) and select Define Storage

Partitioning. The Storage Partitioning wizard will lead you through the process. Note that

an unmapped logical drive must exist to start this wizard.



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