This is an annoying problem:
Switch#write
startup-config file open failed (Not enough space)
Switch#dir nvram:
Directory of nvram:/
%Error opening nvram:/ (Function not implemented)
1048576 bytes total (1034573 bytes free)
Cisco Catalyst switches simulate NVRAM on their flash. Once in a blue moon, this simulated NVRAM will become corrupted. In order to clear up the corruption, I changed the size of the NVRAM and rebooted:
aus-bone-02#show boot
BOOT path-list : flash:c3750me-i5k91-mz.122-58.SE2/c3750me-i5k91-mz.122-58.SE2.bin
Config file : flash:/config.text
Private Config file : flash:/private-config.text
Enable Break : no
Manual Boot : no
HELPER path-list :
Auto upgrade : yes
Auto upgrade path :
NVRAM/Config file
buffer size: 1048576
Timeout for Config
Download: 0 seconds
Config Download
via DHCP: disabled (next boot: disabled)
Notice that the size of the simulated NVRAM is 1,048,576 bytes. We'll change it back to the default (512K).
Switch#config t
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)#boot buffersize 524288
Switch(config)#^Z
Switch#show boot
BOOT path-list : flash:c3750me-i5k91-mz.122-58.SE2/c3750me-i5k91-mz.122-58.SE2.bin
Config file : flash:/config.text
Private Config file : flash:/private-config.text
Enable Break : no
Manual Boot : no
HELPER path-list :
Auto upgrade : yes
Auto upgrade path :
NVRAM/Config file
buffer size: 524288
Timeout for Config
Download: 0 seconds
Config Download
via DHCP: disabled (next boot: disabled)
After reload:
Switch#dir nvram:
Directory of nvram:/
500 -rw- 8807 startup-config
501 ---- 2072 private-config
1 ---- 35 persistent-data
524288 bytes total (512333 bytes free)