When the Compact Flash Is Removed from the Boot List

You can have a compact flash error when conditions, such as a HARD READ error occurs. When the compact flash is removed from the boot list, the following message displays you log in to the router:

login: user

--- JUNOS 6.0R1.6 built 2003-09-24 04:06:27 UTC

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--- NOTICE: System is running on alternate media device     (/dev/ad1s1a).

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user@host>

Action

Check to see which file system is mounted by using the following CLI command:

user@host> show system storage

Sample Output

user@host> show system storage 

Filesystem        512-blocks       Used      Avail Capacity Mounted on

/dev/ad1s1a           218690      56502     144694     28%  /

devfs                     32         32          0    100%  /dev/

/dev/vn0               18316      18316          0    100%  /packages/mnt/jbase

devfs                     32         32          0    100%  /dev/

/dev/vn1               45448      45448          0    100% 
/packages/mnt/jkernel-6.0R1.6

/dev/vn2               20532      20532          0    100%  
/packages/mnt/jpfe-M160-6.0R1.6

/dev/vn3                3580       3580          0    100%  
/packages/mnt/jdocs-6.0R1.6

/dev/vn4               20728      20728          0    100%  
/packages/mnt/jroute-6.0R1.6

/dev/vn5                9256       9256          0    100%  
/packages/mnt/jcrypto-6.0R1.6

mfs:139              4064278          2    3739134      0%  /tmp

/dev/ad1s1e            24234          4      22292      0%  /config

procfs                     8          8          0    100%  /proc

/dev/ad1s1f         52492630    7988510   40304710     17%  /var

What It Means

The command output will not show ad0 (the compact-flash) mounted, but instead, ad1 (the hard disk) has the root file system mounted.