最近处理的一个故障，客户上周联系我说设备断电了一下，重新来电之后有部分区域的AP 有问题，无法远程，赶赴现场处理：
经过沟通发现故障是掉电后部分AP 无法连接，但是WLC 的配置没有修改过
排障：
1.检查WLC 配置对比一个月前的配置，基本没区别（除了个别AP更换名字）
2.检查其他AP连接PC 客户端正常
3.检查有线网络，测试正常
4.AP 已加入WLC
5.检查日志，有报错，报错log( 这里当时忘记截图了，网上找了些):
Write of the Private File nvram:/lwapp_ap.cfg.bak Failed%LWAPP-3-CLIENTERRORLOG: Save LWAPP Config: error saving config file
*May 15 03:26:56.407: %DOT11-6-DFS_TRIGGERED: DFS: triggered on frequency 5320 MHz
*May 15 03:26:57.731: Write of the Private File nvram:/lwapp_ap.cfg Failed on compare RCA needed (try = 1)
*May 15 03:26:57.847: Write of the Private File nvram:/lwapp_ap.cfg Failed on compare RCA needed (try = 2)
Write of the Private File nvram:/lwapp_ap.cfg.bak Failed%LWAPP-3-CLIENTERRORLOG: Save LWAPP Config: error saving config file
Write of the Private File nvram:/lwapp_ap.cfg.bak Failed%LWAPP-3-CLIENTERRORLOG: Save LWAPP Config: error saving config file
既然提示了NVRAM 就看下存储
AP4F_2# fsck flash:
Fsck operation may take a while. Continue? [confirm]
%Error fscking flash: (Device or resource busy)
AP4F_2# fsck flash:
Fsck operation may take a while. Continue? [confirm]
flashfs[2]: inconsistent sector list, fileid 172, parent_fileid 0
AP4F_2show flash:
Directory of flash:/
%Error opening flash:/ (Invalid argument)
show fil sys 报错为--
搜索关键字报错信息：
Write of the Private File nvram:/lwapp_ap.cfg.bak Failed
查询到如下bug::: CSCvb12134
既然是bug 还好说一点，我还以为是断电导致flash 坏了，较为吓人
处理方法就是升级WLC ，然后重启所有AP 升级到修复此bug 的版本即可，我跨了一个版本，没有升级为最新的。
经过沟通发现故障是掉电后部分AP 无法连接，但是WLC 的配置没有修改过
排障：
1.检查WLC 配置对比一个月前的配置，基本没区别（除了个别AP更换名字）
2.检查其他AP连接PC 客户端正常
3.检查有线网络，测试正常
4.AP 已加入WLC
5.检查日志，有报错，报错log( 这里当时忘记截图了，网上找了些):
Write of the Private File nvram:/lwapp_ap.cfg.bak Failed%LWAPP-3-CLIENTERRORLOG: Save LWAPP Config: error saving config file
*May 15 03:26:56.407: %DOT11-6-DFS_TRIGGERED: DFS: triggered on frequency 5320 MHz
*May 15 03:26:57.731: Write of the Private File nvram:/lwapp_ap.cfg Failed on compare RCA needed (try = 1)
*May 15 03:26:57.847: Write of the Private File nvram:/lwapp_ap.cfg Failed on compare RCA needed (try = 2)
Write of the Private File nvram:/lwapp_ap.cfg.bak Failed%LWAPP-3-CLIENTERRORLOG: Save LWAPP Config: error saving config file
Write of the Private File nvram:/lwapp_ap.cfg.bak Failed%LWAPP-3-CLIENTERRORLOG: Save LWAPP Config: error saving config file
既然提示了NVRAM 就看下存储
AP4F_2# fsck flash:
Fsck operation may take a while. Continue? [confirm]
%Error fscking flash: (Device or resource busy)
AP4F_2# fsck flash:
Fsck operation may take a while. Continue? [confirm]
flashfs[2]: inconsistent sector list, fileid 172, parent_fileid 0
AP4F_2show flash:
Directory of flash:/
%Error opening flash:/ (Invalid argument)
show fil sys 报错为--
搜索关键字报错信息：
Write of the Private File nvram:/lwapp_ap.cfg.bak Failed
查询到如下bug::: CSCvb12134
既然是bug 还好说一点，我还以为是断电导致flash 坏了，较为吓人
处理方法就是升级WLC ，然后重启所有AP 升级到修复此bug 的版本即可，我跨了一个版本，没有升级为最新的。
