Checking The Array Status; Managing Resources - Hitachi AMS 2100 Hardware Manual

Checking the array status

Hitachi Data Systems strongly recommends that you periodically check the
array status in the Array List window. Whenever Navigator 2 is launched,
queries the arrays that are registered in its database and updates the
information in the Array List window. You can also update the information
by clicking Refresh Information in the upper menu (see the above
illustration).
In addition, the Navigator 2 Alerts and Events window displays information
about errors and all events that have occurred in the array. It is a good idea
to view this window on a regular basis to check for errors and whenever you
receive an email or other alert that an error has occurred. It is also a good
way to review all commands and actions that have been used to make
changes to the array to help determine the cause of an error. See the Error
Monitoring help page in Navigator 2 for detailed information.

Managing resources

The resources in an AMS 2100/2300 array include RAID groups and host
groups.
Working with RAID groups
A RAID (Redundant Array of Independent Disk) group is a group of disk
drives that constructs single or multiple parity groups. A RAID group can be
considered as the actual RAID container for data protection, and the parity
group as a partition of the container. This way, multiple LUNs can be created
from each RAID group, and ported out to the same or different servers
(hosts). This allows granularity in LUN sizes being obtained from the RAID
group.
A logical unit, generally referred to by its logical unit number (LUN) is
created within a RAID group.
Configuration
Hitachi AMS 2100/2300 Storage System Hardware Guide
7–37