Synchronizing Flash Cards Of Different Capacities; Disabling Autosynchronization - Juniper SYSTEM BASICS - CONFIGURATION GUIDE V 11.1.X Configuration Manual

Synchronizing Flash Cards of Different Capacities

If the capacity of the primary flash card is equal to or smaller than that of the
redundant flash card, the router copies all the files from the primary flash card to
the redundant flash card. However, if the capacity of the primary flash card exceeds
that of the redundant flash card, the router creates a hidden synchronization reserve
file on the primary flash card, provided enough space is available for the file.
The purpose of the synchronization file is to prevent the creation of data that cannot
fit on the redundant flash card. The file contains no useful data, and does not appear
when you view the files in NVS. The size of the file is equal to the difference in
capacities of the two flash cards. For example, if the primary flash card has a capacity
of 224 MB, and the redundant flash card has a capacity of 220 MB, the size of the
synchronization file is 4 MB, and only 220 MB of space is available on the primary
flash card.
If the primary flash card does not have enough space to create the synchronization
reserve file, the synchronize command fails, and you see a warning message on the
console. To resolve this issue, either delete unwanted files from the primary flash
card or replace the redundant flash card with a higher-capacity flash card.

Disabling Autosynchronization

If autosynchronization is enabled while you are copying long scripts or installing new
software releases, it detects a disparity between the modules during the middle of
the process. This feature causes significant unnecessary synchronization, resulting
in prolonged copy times.
If you have installed a redundant SRP module, perform the following steps before
copying long scripts:
1.
2.
3.
4.
Refer to the commands and guidelines in the previous section and in the sections
that follow.
disable-autosync
Turn off autosynchronization with the disable-autosync command.
Perform the installation or copy the script.
Reenable autosynchronization with the no disable-autosync command.
Manually synchronize the modules with the synchronize command.
Use to turn off automatic synchronization between the primary and redundant
SRP modules.
Example
host1(config)#disable-autosync
Use the no version to revert to the default situation, in which automatic
synchronization runs as a background process every 5 minutes.
See disable-autosync.
Chapter 6: Managing Modules
Managing Flash Cards on SRP Modules
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