HP Storage Essentials SRM 6.0 User Guide for Enterprise Edition and Standard Edition SRM Software (July 2008)

Discovering Switches, Storage Systems, NAS Devices, and Tape Libraries76
Using Discovery Groups
The discovery groups feature is sometimes called segmented replication because it allows you to
run Discovery Data Collection for a segment of elements. Because The HP Storage Essentials
product runs more slowly when Discovery Data Collection is in progress, it is helpful to break the
process into segments which can then be run at night or on multiple days. For example, if Discovery
Data Collection for all elements takes twelve hours, you could break the elements into several small
groups and schedule Discovery Data Collection to run at night on multiple days.
NOTE: For more about data collection, see ”About Discovery Data Collection” on page 67.
When planning discovery groups, consider the following requirements and capabilities:
• By default, HP Storage Essentials is configured with a default discovery group plus four
additional groups.
• Discovery groups affect the amount of memory needed for HP Storage Essentials. Before
configuring discovery groups, check the support matrix for your edition and verify that your
system meets the memory requirements for using discovery groups.
• Do not move elements between discovery groups when Discovery Data Collection is running. If
you do this, an error will occur when Discovery Data Collection tries to locate elements that were
moved.
• An element can be a member of only one discovery group at a time.
• Elements discovered through SMI-S and hosts discovered with CIM extensions from Build 5.1
and later of HP Storage Essentials cannot be added to discovery groups. These elements can,
however, be placed independently into scheduled Discovery Data Collection tasks without
being part of a discovery group. This allows you greater flexibility when gathering discovery
data. For more information, see ”Creating Custom Discovery Lists” on page 76.
• When an element in a discovery group is updated, its dependent elements are also updated.
• Each discovery group communicates over a specific port. The defaults ports are:
Rejected This task has been rejected by this server.
Table 9 Task Status descriptions (continued)
Status Description
Table 10 Discovery Group Ports
Default 5986
Discovery Group 1 5984
Discovery Group 2 5982
Discovery Group 3 5980
Discovery Group 4 5978