Step 4: Check the Router File System and Boot Disk

Action

Table 43 specifies the storage media by Routing Engine type. The device names are displayed when the router boots. To display the Routing Engine type on some routers, use the show chassis hardware CLI command.

Table 43: Storage Media Device Names

Storage Media	RE-M40 (RE1)	RE-400 (RE5)	RE-333 (RE2)/ RE-600 (RE3)	RE-1600 (RE4)
Flash drive	ad0	ad0	ad0	ad0
Hard disk	ad2	ad1	ad1	ad1
Removable media	afd0	ad3	ad3	ad3 and ad4

Action

To check the router file system and on which disk the router booted, use the following CLI command:

user@host> show system storage

Sample Output

user@host> show system storage

  Filesystem  1K-blocks     Used    Avail Capacity  Mounted on

  /dev/ad0s1a     65687    26701    33732    44%    /

  devfs              16       16        0   100%    /dev/

  /dev/vn1         9310     9310        0   100%    /packages/mnt/jbase

  /dev/vn2         8442     8442        0   100%    
/packages/mnt/jkernel-5.0R5.1

  /dev/vn3        11486    11486        0   100%    /packages/mnt/jpfe-5.0R5.1

  /dev/vn4         5742     5742        0   100%    /packages/mnt/jroute-5.0R5.1

  /dev/vn5         1488     1488        0   100%    
/packages/mnt/jcrypto-5.0R5.1

  /dev/vn6          792      792        0   100%    /packages/mnt/jdocs-5.0R5.1

  mfs:181        762223        3   701243     0%    /tmp

  /dev/ad0s1e     25263        7    23235     0%    /config

  procfs              4        4        0   100%    /proc

  /dev/ad1s1f   7156052   337194  6246374     5%    /var

What It Means

The command output displays statistics about the amount of free disk space in the router's file systems, including the amount used, the amount available, and the percentage of system space being used. The values are displayed in 1024-byte (1KB) blocks.

Filesystem is the name of the file system on which the Routing Engine booted. The command output also displays the directory to which the file system is mounted. During normal operation, the / and /config directories are from the compact flash drive and the /var directory is from the hard drive. If the router booted off the hard drive, the show system storage command will show all three directories on the hard drive. If the hard drive fails and the router booted off the compact flash drive, the show system storage command will show all three directories on the compact flash drive.