故障描述
AP型号：AP1572
执行操作：进行AP的镜像转换，通过archive命令实现。
报错内容：
Unable to create temp dir "flash:/update"
Download image failed, notify controller!!! From:8.3.102.0 to 0.0.0.0, FailureCode:7
AP升级操作
1.AP的版本镜像为8.3.102，需要升级到其他版本，首先从Cisco官网下载到对应的镜像，例如：c1570-k9w8-tar.153-3.JPS.tar
2.Console登录到AP的命令行，输出命令：archieve download-sw /overwrite tftp://10.1.2.254/c1570-k9w8-tar.153-3.JPS.tar 命令，从TFTP服务器获取目标镜像。
AP001#archive download-sw /overwrite tftp://10.1.2.254/c1570-k9w8-tar.153-3.JPS.tar
##注意##
前提肯定是在服务器上开启了TFTP服务，且服务器的根目录存在了目标镜像！
执行如上命令后出现如下报错：
Unable to create temp dir "flash:/update"
Download image failed, notify controller!!! From:8.3.102.0 to 0.0.0.0, FailureCode:7
AP001#
ERROR: Image is not a valid IOS image archive.
Download image failed, notify controller!!! From:8.3.102.0 to 0.0.0.0, FailureCode:3
排查操作
1.尝试在CLI输入dir或dir flash:等命令，看看是否有提示或是否能够查看。
AP001#dir
Directory of flash:/
2 -rwx 64 Jul 8 2017 14:23:30 +00:00 sensord_CSPRNG0
3 -rwx 251 Mar 1 1993 00:00:31 +00:00 mesh_port_cfg.txt
4 -rwx 278 Jan 1 1970 00:05:40 +00:00 info
24 drwx 960 Dec 19 2016 07:05:08 +00:00 c1570-k9w8-mx.153-3.JD
5 -rwx 341 Jul 8 2017 14:23:30 +00:00 env_vars
8 -rwx 6168 Jul 8 2017 14:27:53 +00:00 private-multiple-fs
232 -rwx 0 Mar 1 1993 00:00:58 +00:00 config.txt
233 drwx 0 Mar 1 1993 00:01:03 +00:00 configs
9 drwx 0 Jul 8 2017 14:27:53 +00:00 update
6 -rwx 64 Jul 8 2017 14:23:30 +00:00 sensord_CSPRNG1
7 -rwx 77786 Jul 8 2017 14:23:35 +00:00 event.log
40900608 bytes total (27873280 bytes free)
AP001#dir flash:update
Directory of flash:/update/
No files in directory
40900608 bytes total (27857920 bytes free)
可以看到这里可以通过dir查看到flash，且目前还有27MB多的空间，所以空间应该是足够的。
2.这个时候还是可以尝试对flash进行fsck flash:操作。该操作是对设备的闪存进行文件系统检查和修复。
AP001#fsck flash:
Fsck operation may take a while. Continue? [confirm]
flashfs[2]: 22 files, 6 directories
flashfs[2]: 0 orphaned files, 0 orphaned directories
flashfs[2]: Total bytes: 40900608
flashfs[2]: Bytes used: 13027328
flashfs[2]: Bytes available: 27873280
flashfs[2]: flashfs fsck took 10 seconds.
Fsck of flash: complete
AP001#
3.进一步执行镜像转换操作。发现还是报错
AP001#archive download-sw /overwrite tftp://10.1.2.254/c1570-k9w8-tar.153-3.JPS.tar
Unable to create temp dir "flash:/update"
Download image failed, notify controller!!! From:8.3.102.0 to 0.0.0.0, FailureCode:7
AP001#
ERROR: Image is not a valid IOS image archive.
Download image failed, notify controller!!! From:8.3.102.0 to 0.0.0.0, FailureCode:3
4.尝试清除AP的配置，通过命令clear capwap private-config，执行重启后，依然是如上报错。
5.既然在报错"flash:/update"，我们尝试将该文件夹删除。
AP001#delete flash:update
Delete filename [update]?
Delete flash:/update? [confirm]
%Error deleting flash:/update (Is a directory)
AP001#
##这里是文件夹，所以可以用rmdir命令##
AP001#rmdir flash:update
Remove directory filename [update]?
Delete flash:/update? [confirm]
Removed dir flash:/update
AP001#
6.删除update的文件夹之后，再尝试操作执行镜像转换。这里就可以了！！！
AP001#archive download-sw /overwrite tftp://10.1.2.254/c1570-k9w8-tar.153-3.JPS.tar
examining image...
Loading c1570-k9w8-tar.153-3.JPS.tar from 10.1.2.254 (via BVI1): !
extracting info (285 bytes)
Image info:
Version Suffix: k9w8-.153-3.JPS
Image Name: c1570-k9w8-mx.153-3.JPS
Version Directory: c1570-k9w8-mx.153-3.JPS
Ios Image Size: 12012032
Total Image Size: 13281792
Image Feature: WIRELESS LAN|LWAPP
Image Family: C1570
Wireless Switch Management Version: 17.14.0.79
MwarVersion:08046400.First AP Supported Version:08006600.
Image version check passed
Extracting files...
c1570-k9w8-mx.153-3.JPS/ (directory) 0 (bytes)
c1570-k9w8-mx.153-3.JPS/html/ (directory) 0 (bytes)
c1570-k9w8-mx.153-3.JPS/html/level/ (directory) 0 (bytes)
extracting c1570-k9w8-mx.153-3.JPS/c1570-k9w8-mx.153-3.JPS (12009183 bytes)!!!!!!!!!!
至此，镜像操作可以转换完成。
解决方法总结
当出现如下报错的时候：
Unable to create temp dir "flash:/update"
Download image failed, notify controller!!! From:8.3.102.0 to 0.0.0.0, FailureCode:7
AP001#
ERROR: Image is not a valid IOS image archive.
Download image failed, notify controller!!! From:8.3.102.0 to 0.0.0.0, FailureCode:3
可以尝试操作：
1.fsck flash:
2.rmdir flash:update
如上操作执行后，再尝试执行镜像转换操作。
