On 6509 with dual sup 32 and 720 is crashinfo file is enabled by default on the running config
do we need to configure this option on switch.
How can we check in running config if crashinfo is configured or not ?
Yes, thst is correct.
To add to what's already been said, on a Cisco 3600 series only, there is a way to disable the creation of crashinfo files via the no exception crashinfo file device:filename command. Refer below for more information:
You can configure the exception crashinfo maximum files command, however, on a Cisco IOS device to automatically delete old crashinfo files. This functionality helps the device create space to write the new crashinfo files when the device crashes. This feature also allows you to configure the number of most recent crashinfo files on a device to be saved when no file system has enough space in which to write new crashinfo files.
This feature was introduced in IOS version 12.3(11)T. This feature is useful when there isn't enough space available across the device's file systems to write new crashinfo files.
Please refer below for more information:
Hope it helps,