Workaround for GNS3 (Dynamips) issue - no enough space on flash

Workaround for the issue of no enough space on flash:,  then cannot create any additional vlans.

Condition:
IOS: 3700 Software (C3725-ADVENTERPRISEK9-M), Version 12.4(15)T13
Modules: NM-16ESW


Getting error messages like below from switch module.
% not enough space on flash to store vlan database. trying squeeze...First create squeeze log by erasing the entire device

% error squeezing flash - (Missing or corrupted log)
Error on database apply 40: NV storage failure
Use 'abort' command to exit

Steps:

1) change directory to flash:
cd flash:

Rack1SW3#cd flash:
Rack1SW3#dir

2) erase flash:

Rack1SW3#erase flash:
Erasing the flash filesystem will remove all files! Continue? [confirm]
Erasing device... eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee ...erased
Erase of flash: complete

3) Squeeze flash:

Rack1SW3#squeeze flash:
Squeeze operation may take a while. Continue? [confirm]
Squeeze of flash complete
Rack1SW3#

4) Try to create vlan again

Rack1SW3(config)#vlan 3
Rack1SW3(config-vlan)#exit
Rack1SW3(config)#int vlan 3
Rack1SW3(config-if)#