The server has redundant clock boards. The active clock board provides the working clock signals. If the active clock board fails, the standby clock board can be made the active clock board.
The factory default configuration makes CLOCK0 the active clock board and CLOCK1 the standby clock board.
The server supports two types of clock boards:
Dual-synthesizer Clock Board. If one clock synthesizer fails on the active clock board, the remaining clock synthesizer will function until the failed clock board is replaced, or the standby clock board is made the active clock board. This type of clock board is standard in the SPARC M6-32 server.
Single-synthesizer Clock Board. If an active clock board with a single clock synthesizer fails, the standby clock board must manually be made the new active clock board. This type of clock board was standard in the original SPARC M5-32 server.
Note - The server supports the mixing of dual- and single-synthesizer clock boards. For maximum system redundancy, the dual-synthesizer clock board should be the active clock board.
Note - The SPARC M5-32 server requires new firmware to use the dual-synthesizer clock board. Refer to the latest Server Product Notes, upgrading the SPARC M5-32 server.