Administrator Guide

Table 23. Available host groups, hosts, and initiators (continued)
Row description Group Host Nickname ID
this row to apply
map settings to this
initiator.
name
The Available Volume Groups and Volumes table shows one or more of the following rows:
Table 24. Available volume groups and volumes
Row description Group Name Type
A row with these values
appears for a volume/
snapshot that is grouped into
a volume group. Select this
row to apply map settings to
all volumes/snapshots in this
volume group.
volume-group-name * Group
A row with these values
appears for each volume/
snapshot. Select this row to
apply map settings to this
volume/snapshot.
- volume-name volume-type
● When you select one or more host groups, hosts, or initiators in the Hosts topic, the items appears in the Available
Host Groups, Hosts, and Initiators table while all available volumes, volume groups, and snapshots appear in the Available
Volume Groups and Volumes table.
● The converse is true when you select one or more volumes, volume groups, or snapshots in the Available Volume Groups
and Volumes table.
● When you open the Map panel through the Mapping topic without selecting a mapping, both tables are fully populated
with all available items.
● When you select a mapping in the mapping table, it appears in the list of mappings below the above two tables. Also, both
tables are fully populated.
2. Perform one of the following:
● If nothing was pre-selected, select one or more initiators and one or more volumes to map and click the Map button.
● If initiators were pre-selected, select volumes to map to those initiators and click the Map button.
● If volumes were pre-selected, select initiators to map to those volumes and click the Map button.
● If maps were pre-selected, they already appear in the mapping table and a Map button appears.
For each pairing of selected initiators and volumes, a row appears in the mapping table at the bottom of the panel. At this
time, no further mappings can be added to the list. Mappings in the list can be modified—including the mapping's mode,
LUN, or ports, or they can be deleted.
NOTE:
Once a set of mappings between initiators and volumes have been defined using the Map button, the button
changes from Map to Reset. If mappings have been pre-selected, the Reset button, not the Map button, appears.
3. Perform any of the following:
● To immediately remove a row from the table, in the Action column, select Remove Row.
● To delete an existing mapping, in the Action column, select Delete.
● To edit a mapping, set the following options:
○ Mode. The access mode can specify read-write access, read-only access, or no access to a volume. The default is
read-write. When a mapping specifies no access, the volume is masked, which means it is not visible to associated
initiators. Masking is useful to override an existing default map that allows open access so that access is denied only
to specific initiators. To allow access to specific hosts and deny access to all other hosts, create explicit maps to
those hosts. For example, an engineering volume could be mapped with read-write access for the engineering server
and read-only access for servers used by other departments.
○ LUN. The LUN identifies the volume to a host. The default is the lowest available LUN. Both controllers share one
set of LUNs, and any unused LUN can be assigned to a mapping. However, each LUN is generally only used once as
a default LUN. For example, if LUN 5 is the default for Volume1, no other volume in the storage system can use LUN
5 on the same port as its default LUN. For explicit mappings, the rules differ: LUNs used in default mappings can be
reused in explicit mappings for other volumes and other hosts.
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Working in the Mappings topic