HP 3000 Enterprise Virtual Array - Manual (Page 107)

Storage System Hardware Components
107 Enterprise Virtual Array 3000 User Guide
Reporting Group Feature
Another function of the enclosure address bus is to establish reporting groups.
Because multiple storage systems can be connected to the same enclosure address
bus, reporting groups are used to isolate the communication between storage
systems. A component can only communicate with other components within its
reporting group.
A reporting group (rG) is an HSV100 controller pair and the associated drive
enclosures. The controller pair automatically assigns a unique (decimal) four-digit
Reporting Group Number (RGN) to each EMU on an FC-AL.
Each of the drive enclosures on a loop pair are in one reporting group. All of the
drive enclosures on loop pair 1, both loop 1A and loop 1B, share a common
reporting group number.
Each EMU collects environmental information from its disk enclosure and
broadcasts the information to reporting group members using the enclosure
address bus. Information from enclosures in other reporting groups is ignored.
Reporting Group Numbers
The reporting group number (RGN) range is decimal values 0000 through 4099:
■ 0000 is reserved for enclosures that are not part of any reporting group, a
JBOD configuration.
■ 0001 through 0015 are RGNs reserved for use by the EMU. When you enter
them, they default to 0000.
■ 0016 through 4095 are valid RGNs.
■ 4096 through 4099 are invalid RGNs. When you enter them, they default to
4095.
The reporting group numbers are displayed on the EMU alphanumeric display as
a pair of two-digit displays. These two displays are identified as rH and rL.
■ Valid rH displays are in the range 00 through 40, and represent the high-order
(most significant) two-digits of the RGN.
■ Valid rL displays are in the range 00 through 99, and represent the low-order
(least significant) two-digits of the RGN.
Viewing Reporting Group Number
Perform the following procedure to view a reporting group number:
1. Press and release the bottom pushbutton until the alphanumeric display is rG.
2. Press and hold the top pushbutton unit the display is rH.