Juniper SYSTEM BASICS - CONFIGURATION GUIDE V 11.1.X Configuration Manual page 415

NOTE: Both the flash-disk compare and synchronize low-level-check commands
perform CPU-intensive processing that can take several minutes to complete. For
best results, do not run these commands simultaneously on the same router. In
addition, do not run multiple instances of the flash-disk-compare command
simultaneously on the same router.
flash-disk compare
Validate all files in NVS (when you use the all keyword) or only configuration
files in NVS (when you use the configuration keyword).
Synchronize all files that failed the checksum test during the flash-disk
compare command, as well as any other unsynchronized files.
host1#synchronize low-level-check all
host1#synchronize low-level-check configuration
This action resolves any file discrepancies between the primary and
redundant SRP modules and restore SRP file integrity.
Use to perform a checksum validation that compares the contents of the NVS
file system on the primary SRP module with the contents of the NVS file system
on the redundant SRP module.
The command validates only those files that are synchronized between the
primary and redundant SRP modules; it does not validate log files, core dump
files, and other files that are excluded from the system synchronization process.
Specify one of the following keywords:
all Compares all files in NVS; this option can take several minutes to
complete.
configuration Compares only configuration files; this option takes less
time to complete because it compares only a subset of the files in the NVS
file system.
If all files pass the validation test, the router reports that all checksums matched
and displays the total number of files and total number of bytes of information
compared.
If one or more files fail the validation test, the router reports a checksum test
failure and does not display the total number of files and bytes compared.
If one or more of the following conditions exist, the command fails and the router
displays a message that explains why it cannot perform the checksum test:
The file systems on the primary flash card and the redundant flash card are
not synchronized.
The router does not contain a redundant SRP module.
The redundant SRP module is offline.
Example 1 Shows output when all files passed the validation test
Chapter 6: Managing Modules
Managing Flash Cards on SRP Modules
385