The File System
170 Basic System Configuration Guide
Compact Flash Devices
The file system is based on a DOS file system (with an optional Reliance file system). In the
7750 SR and 7450 ESS, each control processor can have up to three compact flash 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 routers are removable and
have an administrative state (shutdown/no shutdown).
The cf2: and cf3: compact flash devices on the 7950 XRS routers are removable and have an
administrative state (shutdown/no shutdown). cf1: is an internal SSD.
URLs
The arguments for the SR OS file commands are modeled after standard universal resource
locater (URL). A URL refers to a file (a file-url) or a directory (a directory-url).
The SR OS supports operations on both the local file system and on remote files. For the
purposes of categorizing the applicability of commands to local and remote file operations,
URLs are divided into three types of URLs: local, ftp and tftp. The syntax for each of the URL
types are listed in Table 24.
Note: To prevent corrupting open files in the file system, you should only remove a compact
flash that is administratively shutdown. The SR OS gracefully closes any open files on the
device, so it can be safely removed.
Table 24: URL Types and Syntax
URL Type Syntax Notes
local-url [cflash-id:\]path cflash-id is the compact flash device name.
Values: cf1:, cf2:, cf3:
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