在服务器维护中，通过OOB带外操作重启服务器，会在服务器的sel服务器事件日志中记录对应日志，例如

 2cf | 10/02/2016 | 11:18:16 | Unknown #0xcb |  | Asserted
 2d0 | 10/02/2016 | 11:18:29 | Unknown #0xcb |  | Asserted
 2d1 | 10/02/2016 | 11:18:32 | System ACPI Power State #0xc1 | S4/S5: soft-off | Asserted
 2d2 | 10/02/2016 | 11:20:15 | System ACPI Power State #0xc1 | S0/G0: working | Asserted
 2d3 | 10/02/2016 | 11:20:15 | Unknown #0xcb |  | Asserted
 2d4 | 10/02/2016 | 11:20:43 | System Boot Initiated #0xe0 | Initiated by power up | Asserted
 2d5 | 10/02/2016 | 11:23:01 | Unknown #0xcb |  | Asserted
 2d6 | 10/02/2016 | 11:23:27 | System Boot Initiated #0xe0 | Initiated by power up | Asserted

为方便理解，汇总整理常见操作的对应sel日志

ipmitool指令	sel对应日志
`chassis power status`	无记录
`chassis power off`	`Unknown #0xcb` + `System ACPI Power State #0xc1 S4/S5: soft-off`
`chassis power on`	`System ACPI Power State #0xc1 S0/G0: working` + `Unknown #0xcb` + `System Boot Initiated #0xe0 Initiated by power up`
`chassis power reset`	`Unknown #0xcb` + `System Boot Initiated #0xe0 Initiated by power up`

OOB电源状态切换都会记录一条 Unknown #0xcb

OOB关闭电源记录 S4/S5: soft-off

OOB开启电源记录 S0/G0: working

电源开启关闭都记录ACPI状态变化 System ACPI Power State #0xc1

ipmi操作和对应的sel日志记录

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