Specifications

AMF Introduction and Configuration
New and Enhanced Features in AlliedWare Plus 5.4.4 Major and Minor Versions 137
AMF Backups
AMF backups are a valuable part of AMF network operation. They are the mechanism by
which AMF master nodes update their records of the AMF network. By default, AMF
master nodes are configured to perform automatic scheduled backups of the entire AMF
network once per day at 3.00am. AMF backups can be stored on remote file servers or
external removable media such as USB sticks or SD cards. These backup files can be used
in the recovery of a failed node.
Note that this feature will operate only on AMF master nodes.
Using External Media Storage
If storing data on external media, it is a requirement that all AMF masters have external
removable media installed with sufficient capacity to hold all of the relevant files stored in
the Flash on every node in the AMF network.
Typically a 4 GB capacity external media storage would be of sufficient size to hold
backups for a 40 node AMF network.
The AMF node backup system has been designed such that the external media used to
store the backup data can still be used to store other data. However, care needs to be
taken to ensure that enough space is reserved for future AMF backups.
■ AMF requires up to 128 MB backup space for SBx8100 nodes and up to 64 MB backup
space for other nodes. The output from the show atmf backup command on
page 222 will provide warnings if capacity on the backup media falls below a safe
level.
Here is an output example from the show atmf backup command showing a backup
media space warning:
Figure 10: Output showing backup media space warning
Safe removal of external storage media
Removing external storage media, or rebooting the master node, while an AMF backup is
underway could potentially cause corruption to files in the backup. Although files
damaged as a result of mishandling backup media will be replaced during the next
backup cycle, if the file system on the media becomes damaged, it may require
reformatting before being inserted into the AMF master. To avoid any damage to the AMF
backup files or file system, we recommend that the following procedure be followed
before rebooting or removing any external storage media from an AMF master.
1. Disable backups to prevent a scheduled backup from occurring while the card is
being removed.
master1#show atmf backup
Scheduled Backup ...... Disabled
Schedule ............ 1 per day starting at 12:45
Next Backup Time .... 25 May 2014 12:45
Backup Media .......... SD (Total 3827.0MB, Free 7.1MB)
WARNING: Space on backup media is below 64MB
Current Action ........ Idle
Started ............. -
Current Node ........ -