Solaris OE Storage Resource Management: A Practitioner's Approach
Sun Fire™ 38006800 Servers Dynamic Reconfiguration
Dynamic Reconfiguration (DR) is a key component of the Solaris™ Operating Environment (Solaris OE). By using DR, hardware components can be added or removed from a system with minimal interruption. DR increases the overall uptime and availability of systems. While using DR for system upgrades, modifications, or service actions, the Solaris OE and user applications remain operating.
This document contains the following sections about DR:
A general overview of DR
DR implementation on Sun Fire™ 38006800 servers
Best-practice guidelines for DR and command line procedures
To use DR on Sun Fire 38006800 servers, the domain must be running a minimum version of the Solaris OE and a minimum version of the firmware on the Sun Fire server system controller (Sun Fire SSC). These minimum versions are:
Solaris 8 02/02 OE release (on the domain)
ScApp 5.12.6 and RTOS 19 (on the Sun Fire SSC)
DR is automatically enabled on the domain with Solaris 8 02/02 OE release. The Sun™ Management Center (Sun MC) software includes a graphical user interface (GUI) for DR operations in its DR module. This module is provided in the Sun Management Center 3.0 update 4 software release, which is included in the Solaris 8 OE 02/02 release. The cfgadm(1M) command is the command line interface (CLI) for DR on the domains.
DR is performed on attachment points, which consists of two objects: a receptacle and an occupant. The state of the attachment point refers to the condition of the receptacle and occupant. You can use the cfgadm(1M) command or the Sun MC DR module to retrieve the status of attachment points, occupants, and receptacles, along with their condition. The Sun Fire 38006800 servers support the following attachment points:
- I/O assembly (PCI/cPCI assemblies)
- CPU/Memory boards
- cPCI cards
- System memory
Dynamic attachment points are attachment points that are on base attachment points. Dynamic attachment points do not have to support the same DR operations as their base attachment points. On the , the CPU/Memory boards, I/O assemblies, and cPCI cards are base attachment points.
Connecting and Disconnecting Attachment Points
You can connect or disconnect attachment points. When you connect an occupant, its hardware is connected to the interconnect, and its OpenBoot™ PROM structures are created. The DR software performs the power-on self-test (POST) if it is supported by the occupant. In the connected state, the occupant is not available to the Solaris OE. When you disconnect an occupant, it is removed from the interconnect, and after powering off, it is ready for removal.
Configuring and Unconfiguring Attachment Points
You can configure or unconfigure attachment points. When you configure an occupant, the device tree structures are created, and the occupant is available to the Solaris OE. When you unconfigure an occupant, the device tree structures are removed, and the occupant is not usable to the Solaris OE.
DR on Domains
The support multiple domains. You can allocate resources to the domains on a board level by assigning or unassigning them to or from domains by using DR operations. In addition, you can use DR operations on the domain or on the Sun Fire SSC to make an attachment point (for example, a CPU/Memory board or I/O assembly) available to the domain.
Attachment Point States for CPU/Memory Boards and I/O Assemblies
You can change the state of CPU/Memory boards or I/O assemblies by using Sun Fire SSC and DR commands. FIGURE 1 shows the different states of a board or assembly, from the perspective of DR on the Sun Fire SSC.
FIGURE 1 Board States From the Perspective of the Sun Fire SSC
The following table contains descriptions of the states:
TABLE 1 Board State Descriptions
The board or assembly is not in the access control list (ACL) or assigned to another domain.
The board or assembly is listed in the ACL and is not in use by another domain.
The board or assembly is assigned to a domain and is not available to any other domain.
The board or assembly is being used by the domain.
Changing the State of the Board or Assembly
You can verify the state of the CPU/Memory board or I/O assembly on the Sun Fire SSC by using the showboards command or by using the DR module in the Sun MC software (FIGURE 2 shows the attachment points in the CPU board table). If an attachment point is not assigned to a domain, you can connect or configure it.
CPU/Memory board and I/O assembly attachment points are implicitly assigned to a domain as part of a connect or configure operation.
FIGURE 2 CPU Boards in the Sun MC Software
See the "Sample Output From the cfgadm(1M) and showboards Commands" on page 19 for an example of the typical output displayed when using the cfgadm(1M) command on the domain and the showboards command on the Sun Fire SSC.