How to check if your SRX has a dual-partitioned filesystem

19 07 2011

Since Junos 10.0, Junos supports dual-partitioned filesystems so that if the primary filesystem becomes corrupt, there’s a secondary with a copy of Junos in it to get the system to boot.  There’s a good explanation of this here.  Devices on Junos 9.6 and earlier have a single partition, but you can choose to change to dual partitions during an upgrade.

To find out whether your system is dual partitioned, issue the command “show system snapshot media internal” and you should see the following if dual partitions are in use:

root> show system snapshot media internal 
Information for snapshot on       internal (/dev/da0s1a) (primary)
Creation date: Mar 24 12:12:59 2011
JUNOS version on snapshot:
  junos  : 10.4R1.9-domestic
Information for snapshot on       internal (/dev/da0s2a) (backup)
Creation date: Mar 24 12:14:29 2011
JUNOS version on snapshot:
  junos  : 10.4R1.9-domestic
root> 


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