The file system is based on a DOS file system. In the 7750 SR and 7450 ESS, each control processor can have up to three storage devices numbered one through three. In the 7950 XRS, each CCM has an SSD and up to two compact flash devices. The names for these devices are:
cf1:
cf2:
cf3:
The above device names are relative device names as they refer to the devices local to the control processor with the current console session. As in the DOS file system, the colon (‟:”) at the end of the name indicates it is a device.
The three compact flash devices on the 7450 ESS and 7750 SR OS are removable and have an administrative state.
The cf2: and cf3: compact flash devices on the 7950 XRS routers are removable and have an administrative state. cf1: is an internal SSD.
Devices vary by platform as compact flash, SD card, USB, or embedded SSD. The format used for the removable storage devices is DOS FAT32. The maximum size supported is 32 GB.
To prevent corrupting open files in the file system, only remove a compact flash that is administratively shutdown. SR OS gracefully closes any open files on the device, so it can be safely removed.