Chassis ID Numbers on Drive Enclosures

Each Drive Enclosure has a chassis ID number. The chassis ID number uniquely identifies each Drive Enclosure in an Oracle FS System.

Chassis ID Assignments

As part of the initial build process, the system assigns chassis IDs to Drive Enclosures based on their location within the discovered topology. If the Drive Enclosures are cabled according to the factory recommendation, the chassis IDs align with the physical location of the Drive Enclosures in the rack. After a Drive Enclosure has been assigned a chassis ID, the value is persistent across system warm starts and cold starts. You can change the chassis ID for a Drive Enclosure, if necessary, to accurately reflect the physical location of the Drive Enclosure in the rack.

With a factory configuration, chassis ID numbers begin with 01 at the bottom of the left-most rack. The chassis ID numbers increment to the top of a rack and left to right across multiple racks. This assignment of chassis IDs is recommended for all systems to aid service personnel in locating the system components.

For systems with the factory configuration that have not been expanded, the Drive Enclosures are arranged so that the Drive Enclosures in each string are physically adjacent. The Drive Enclosures have consecutive chassis ID numbers.

When adding Drive Enclosures, the system assigns the next available chassis ID value to each newly discovered Drive Enclosure. If chassis ID values were modified in the system, a newly added Drive Enclosure might be assigned a chassis ID value that is lower than the previously installed Drive Enclosures.

Be aware that after successfully expanding a system, the Drive Enclosures in a string will no longer be adjacent in the rack, nor will they have consecutive chassis ID numbers. This is expected and supported. You can use Oracle FS System Manager (GUI) or Oracle FS CLI (FSCLI) to change the chassis IDs.

Note: It is not supported to attempt to physically reposition the Drive Enclosures in the rack to maintain contiguous strings. Repositioning the Drive Enclosures in the rack can create cable length issues, introduce too much time and risk to the expansion procedure, and might require the system to be taken offline.

Very few circumstances cause the chassis ID values to display out of order. Most of those circumstances indicate that an error has occurred. Be careful when modifying chassis ID values.

An example of an out of order chassis ID is on a system restart when the system was shut down in order to add several new Drive Enclosures. On startup, the system assigns chassis ID numbers to each of the new Drive Enclosures.

If the system cannot find one of the new Drive Enclosures (for example, the Drive Enclosure was not properly powered on or cabled) then that Drive Enclosure will not be assigned a chassis ID number. Once the issue is resolved, the system assigns the next available chassis ID number to that Drive Enclosure. Ensure that you understand the root cause of any chassis ID coming up out of order before proceeding.

Chassis ID Display Locations

The chassis IDs are displayed on the front, lefthand side of each Drive Enclosure. The chassis IDs are also displayed in Oracle FS System Manager (GUI) and in the topology map output.

The following figure shows an example of the chassis ID displayed on the Drive Enclosure chassis.

Figure 1: Chassis IDs displayed on the Drive Enclosure chassis

Legend

1 Chassis ID 01 (DE2-24P Drive Enclosure)

2 Chassis ID 02 (DE2-24C Drive Enclosure)

The following figure shows an example of the chassis ID displayed on the Drive Enclosure Overview page.

Figure 2: Chassis IDs displayed on the Drive Enclosure Overview page

Legend

1 Chassis ID 01

2 Chassis ID 02

The following figure shows an example of the chassis ID displayed in the topology output.

Figure 3: Chassis IDs displayed in the topology output

Legend

1 Chassis ID 01

2 Chassis ID 16