Dell DX6012S Руководство по установке и настройке - Страница 21

3.5.2. Automatic Backups

The backup utility watches a pre-determined list of CSN configuration files for file metadata

changes. When a change is detected, the utility waits until the changes stabilize to prevent multiple

incremental backups in a short time period and then creates a gzipped tar file with a complete set of

all designated configuration files. This tar file is staged locally and then written to the storage cluster

for protection. If for any reason, a backup fails to write to DX Storage, an error will be logged and

the backup will be retried periodically. The UUID of the backup set is also written into the Backup

Manifest but is not displayed in the user interface. If the Backup Manifest is not retrievable for any

reason, the backup set is written with metadata that allows retrieval from the DX Storage cluster

using DX Content Router. Specifically, the following two headers will be present:

CAStor-Application-Automatic-Backup: yes

CAStor-Application-Component: saveset

The backup utility will periodically purge backups based on both age and backup count. The utility

will keep at least 20 backups and, if there are more than 20 backups, it will purge any that are more

than 30 days old.

Note

All backup times are displayed in Universal Time (UTC) and may not, therefore,

correspond with the local system clock.

Administrators may wish to occasionally create a backup manually in conjunction with CSN

maintenance activities (system updates, server downtime, etc). To create a manual backup set at

anytime, click the 'Create Backup' button. You will be prompted to enter a description for the backup

to allow you to easily identify it in the backup list at a later date. The user interface will confirm that

the backup request has been successfully received but cannot display errors if the backup fails

several minutes later. Administrators may wish to monitor system logs for Error messages as a

result. Aside from the manual initiation and description, manual backups are identical to automatic

backups. Manual backups are supported once every 30 seconds.

To restore the service configuration files and enabled/disabled status as they existed as part of a

specific backup set, select the radio button next to the desired backup set and click the 'Restore

Backup' button. This will restore all configuration files and each service's status (enabled or

disabled) to their saved state at the time of the selected backup and reboot the server to reinitialize

the network with the previous configuration. Following a successful reboot, administrators should

immediately restart their DX Storage cluster to ensure the internal networks are aligned and the

node IP addresses are maintained.

After upgrade, previous backup sets may be marked as being compatible with a previous software

version if the backup format or system layout has been changed. These backups cannot be restored

with the current version but will remain available if the software is reverted to a previous version

using the csn-reset functionality.

If a primary CSN fails, an administrator can choose to promote a secondary CSN to the primary

CSN role by restoring the primary's backup manifest UUID onto the secondary and then restoring

Version 2.0

December 2010