Synchronizing Flash Cards - Juniper SYSTEM BASICS - CONFIGURATION GUIDE V 11.1.X Configuration Manual

CAUTION: When you eject a mounted disk 0 while the router is in an operational
state, the SRP module initiates a reload. When you eject a mounted disk 1, data on
the disk can be corrupted, but the router does not reboot.
mount

Synchronizing Flash Cards

NOTE: The information in this section does not apply to the ERX310 router, which
does not support SRP module redundancy.
When the router contains two SRP modules, the contents of the modules' flash cards
need to be synchronized. Synchronization prevents the redundant flash card from
overwriting saved files on the primary flash card if the primary SRP module fails and
the redundant SRP module takes control.
By default, autosynchronization is enabled on the router. Autosynchronization runs
as a background process every 5 minutes, tracking changes in image, configuration,
and script files, and keeping the two SRP modules synchronized. You can also
synchronize the SRP modules manually by issuing the synchronize command.
Before synchronization, the router does the following:
Use to mount the disk. If the disk was not safely unmounted previously, then
before mounting the file system and permitting user access the command initiates
disk and file system integrity checks. These checks are the same ones that are
automatically performed when a disk is installed and the SRP module is reloaded.
This command applies only to the flash card installed in slot 1 on an SRP 320
module. The command is rejected if you specify disk0, because that card is
required for system operation and cannot be unmounted.
Example
host1#mount disk1
The no version prepares the flash card for safe removal. The router subsequently
behaves as if the second flash card is no longer present. To access the second
card, you must either eject and re-insert the card, or issue the mount command
for the card. You can use the force keyword to force the dismount even when
files on the flash disk are open for modification.
See mount.
Verifies that critical files on the primary SRP module are present. If files are
missing, the router does not proceed with the synchronization.
Verifies whether there is enough space on the redundant flash card to copy all
the new or changed files from the primary flash card.
Chapter 6: Managing Modules
Managing Flash Cards on SRP Modules
381