Discussion

J-series filesystems on a device connected to the router’s USBport or, for J4300 and
J6300 routers, on a removable compact flash disk.
You can take a snapshot of the software at any time, but you should always do so
before installing a new JUNOS software version so that you can recover to a known,
stable environment in case something goes wrong when you load the software. You
should also always take a snapshot after you have successfully loaded a new version
of the software.
Before installing a new software package, you can use the request system storage
cleanup command to remove older files to free up space in the filesystem. This command
deletes any rotating logfiles in /cf/var/log that are not current files in /cf/var/tmp
that have not been modified in the last two days and all crashfiles in /cf/var/crash.
Before you delete files in the directories, you can use the file list command to
check what they contain:
aviva@RouterA> file list detail /cf/var/tmp
/cf/var/tmp:
total 28
-rw-r--r-- 1 root wheel 6379 Nov 3 00:10 cleanup-pkgs.log
drwxrwxrwx 2 root wheel 512 Apr 15 2005 install/
-rw-r----- 1 root wheel 2492 Nov 3 00:10 sampled.pkts
aviva@RouterA> file list detail /cf/var/log/messages*
-rw-rw-r-- 1 root wheel 65 Nov 3 00:06 /cf/var/log/messages
-rw-rw---- 1 root wheel 2587 Nov 3 00:06 /cf/var/log/messages.0.gz
-rw-rw-r-- 1 root wheel 21746 Apr 16 2005 /cf/var/log/messages.1.gz
-rw-rw---- 1 root wheel 12381 Dec 9 2004 /cf/var/log/messages.10.gz
-rw-rw-r-- 1 root wheel 11066 Apr 9 2005 /cf/var/log/messages.2.gz
-rw-rw-r-- 1 root wheel 12844 Feb 24 2005 /cf/var/log/messages.3.gz
-rw-rw-r-- 1 root wheel 8751 Feb 18 2005 /cf/var/log/messages.4.gz
-rw-rw---- 1 root wheel 12280 Feb 17 2005 /cf/var/log/messages.5.gz
-rw-rw---- 1 root wheel 11486 Feb 10 2005 /cf/var/log/messages.6.gz
-rw-rw---- 1 root wheel 44407 Feb 8 2005 /cf/var/log/messages.7.gz
-rw-rw---- 1 root wheel 22260 Dec 10 2004 /cf/var/log/messages.8.gz
-rw-rw---- 1 root wheel 18618 Dec 9 2004 /cf/var/log/messages.9.gz
total 12
The show log command is another way to find out when logfiles were last modified:
aiva@RouterA> show log
messages Size: 65, Last changed: Nov 03 00:06:10
messages.0.gz Size: 2587, Last changed: Nov 03 00:06:10
messages.1.gz Size: 21746, Last changed: Apr 16 2005
messages.10.gz Size: 12381, Last changed: Dec 09 2004
messages.2.gz Size: 11066, Last changed: Apr 09 2005
messages.3.gz Size: 12844, Last changed: Feb 24 2005
messages.4.gz Size: 8751, Last changed: Feb 18 2005
messages.5.gz Size: 12280, Last changed: Feb 17 2005
messages.6.gz Size: 11486, Last changed: Feb 10 2005
messages.7.gz Size: 44407, Last changed: Feb 08 2005
messages.8.gz Size: 22260, Last changed: Dec 10 2004
messages.9.gz Size: 18618, Last changed: Dec 09 2004
Backing Up Filesystems on J-Series Routers | 47
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