In this documentation, the flash card on the primary SRP module is referred to as the
primary flash card; the flash card on the redundant SRP module is referred to as the
redundant flash card.
If you have two SRP modules installed in a router, you can use flash cards of different
capacities on the SRP modules. The effective capacity of the higher-capacity flash card
equals that of the lower-capacity flash card.
Flash Features
The software contains a number of features that optimize the way the router restores
its configuration if it is shut down improperly:
•
The router tracks improper shutdowns.
•
After an improper shutdown, the router runs an investigation of the file allocation table
(FAT) the next time it reboots.
•
The router creates backups of critical files.
•
When you install a new flash card or restart the router after shutting it down incorrectly,
a utility scans the flash card to detect corrupt sectors. If the utility finds files or
directories that contain corrupt sectors, it removes the files and directories, because
they can no longer be used. The utility also fixes problems with unused sectors. If the
utility cannot correct a corrupt sector, it marks the sectors so that they cannot be
reused. Errors in the boot block, FAT, or root directory are fatal and cannot be corrected
by the scan utility.
•
In a router that contains two SRP modules, if the scanning utility detects corrupt sectors
in flash on the primary SRP module during rebooting, the primary SRP module reboots
again. Both SRP modules now have standby status and reboot. The first SRP module
to complete rebooting becomes the primary. Because the former redundant module
started to reboot first, it likely becomes the primary. When the former primary module
has rebooted and the scan utility has fixed corrupt sectors in its flash card, the SRP
modules will synchronize. Any files or directories removed by the scan utility are restored
during the synchronization.
•
If you reboot the router before it has completely written configuration updates to the
flash card, the router starts with the last saved configuration. If you reboot the router
after it has written the configuration updates to the flash card, but before it has applied
those updates to actual configuration data, the configuration update process resumes
immediately following the reboot and is completed before any application accesses
its configuration data.
Flash Features on the E120 Router and the E320 Router
The E120 and E320 routers can have a second flash card installed with its SRP modules.
Device names are reserved for the E120 and E320 routers flash card slots: disk0, disk1,
standby-disk0, and standby-disk1. For backward compatibility, you can use the name
standby, which is equivalent to standby-disk0. You can use the second card (disk1 or
standby-disk1) only for storage of core dump (.dmp) files. When the a card is installed
and mounted as disk1 or standby-disk1, all .dmp files are automatically stored on this
card. You must use the card mounted as disk0 or standby-disk0 for all other file types.
365
Copyright © 2010, Juniper Networks, Inc.
Chapter 6: Managing Modules
Summary of Contents for JUNOSE 11.3
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