JUNOS High Availability

J Series Considerations

Currently, J Series routers—the chassis most commonly used in the enterprise—are not equipped with a rotating media hard drive. Their on-system memory for storing JUNOS images is limited. As a result, some additional image upgrade commands and options are available as mentioned previously.

Cleanup

J Series chassis support a cleanup command that frees up storage space by deleting files in the /cf/var/tmp/ directory that have not been accessed in the past 48 hours, as well as all crash files in the /cf/var/crash directory. This command also rotates all current logfiles in the /cf/var/log directory. This command takes a minute or two to complete. You can run it immediately before a software upgrade to free up space for the JUNOS image:

lab@r5-re0> request system storage cleanup List of files to delete: Size Date Name 2300B Dec 8 09:39 /cf/var/log/interactive-commands.0.gz 8561B Jun 11 06:00 /cf/var/log/interactive-commands.1.gz 9.8K Jun 10 09:00 /cf/var/log/interactive-commands.2.gz 9290B Jun 2 2008 /cf/var/log/interactive-commands.3.gz 8990B May 20 2008 /cf/var/log/interactive-commands.4.gz 2408B Dec 8 09:39 /cf/var/log/messages.0.gz 11.7K Dec 8 08:00 /cf/var/log/messages.1.gz 14.8K Jul 30 09:00 /cf/var/log/messages.2.gz 11.1K Jul 25 07:00 /cf/var/log/messages.3.gz 5550B Jul 9 19:00 /cf/var/log/messages.4.gz 5527B Jul 9 14:00 /cf/var/log/messages.5.gz 20.3K Jul 9 09:00 /cf/var/log/messages.6.gz 17.0K Jun 11 06:00 /cf/var/log/messages.7.gz 13.0K Jun 10 10:00 /cf/var/log/messages.8.gz ...