Discussion

If the router boots from the hard disk or if you manually reboot from the hard disk
(take a fresh snapshot first, though), you’ll notice that ad0 is still the flash disk and
ad1 is still the hard disk, but the root filesystem is now on the hard disk because
you’re running on alternate media:
aviva@router1> request system reboot media disk
aviva@router1> show system storage
Filesystem Size Used Avail Capacity Mounted on
/dev/ad1s1a 107M 37M 61M 38% /
.
.
.
mfs:172 1.9G 4.0K 1.8G 0% /tmp
/dev/ad1s1e 12M 21K 11M 0% /config
procfs 4.0K 4.0K 0B 100% /proc
/dev/ad1s1f 25G 3.5G 19G 15% /var
The request system reboot media disk command takes a fairly long time to complete,
and you need to log back in to the router when it completes.
See Also
Recipe 1.20
1.20 Backing Up Filesystems on J-Series Routers
Problem
You are preparing to load a different release of the JUNOS software or reload the
current release on a J-series router and you want to save the files that are already on
the router.
Solution
On any J-series router, back up the filesystem to a device that is connected to the
router’s USB port:
aviva@RouterA> request system snapshot media usb
On J4300 and J6300 routers, you can also back up the files in the router’s filesystem
to a removable compact flash disk:
aviva@RouterA> request system snapshot media removable-compact-flash
Before installing the software upgrade, delete old log- and crashfiles:
aviva@RouterA> request system storage cleanup
Discussion
The snapshot process on J-series routers differs from the process for M-series and
T-series routers because of hardware differences. You can place a snapshot of the
46 | Chapter 1: Router Configuration and File Management
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