User's Manual

HP StorageWorks File System Extender Software user guide 235
Aborting FSE restore
CAUTION: HP strongly dissuades aborting the restore process in which actual restore of the FSE server is
performed. If this happens, the FSE server may remain only partially restored, with inconsistencies in the
entities that were backed up, which results in an incorrect FSE operation or no operation at all. Such
circumstances may more than likely lead to a major data loss in the FSE implementation.
Nevertheless, if the above happened, you are advised to contact HP technical support.
To abort an ongoing FSE restore process, you need to abort the fserestore command. Perform the step:
1. In the window where fserestore was invoked, press CTRL+C.
Post-restore steps
After the restore process is complete, on each host of the FSE implementation, run the following command
to start local FSE processes. Note that processes must be started on the consolidated FSE system or FSE
server first:
Recovery
Besides the FSE backup and restore feature that covers only FSE server, FSE provides functionality for
recovering from disasters that may occur on other hosts of the FSE implementation. This functionality is
called FSE recovery. If internal or external FSE client is left with a damaged or destroyed HSM file system,
FSE recovery should be considered as the supplement to the conventional FSE restore process. The
advantage of FSE recovery over FSE backup and restore is that it does not depend on the availability of
FSE backup images.
FSE recovery can resolve the following problems:
• damaged or missing File System Catalog (FSC)
In such circumstances, File System Catalog recovery recreates FSC files on the FSE server from the Fast
Recovery Information (FRI) data and the data migrated to FSE media. The result of this process is File
System Catalog that is consistent with metadata on the associated FSE media.
• damaged HSM file system
In such circumstances, HSM file system recovery recreates damaged HSM file system from the
belonging Name Space Catalog, which is part of the File System Catalog. This recovery method can
also be used in less severe situations, for example, when contents of HSM file system are inconsistent
with entries in the corresponding FSC.
For the recommended ways of combining FSE backup and restore with FSE recovery, see section ”Defining
your backup strategy” on page 219.
File System Catalog recovery
The File System Catalog is recreated either from Fast Recovery Information (FRI), if it is available, or from
the migrated metadata.
NOTE: During an FSC recovery, media reorganization is inhibited.
Note that the results of a previously implemented reorganization scan are invalidated by an FSC recovery.
The File System Catalog recovery procedure
To perform FSC recovery, proceed as follows:
1. Disable the problematic FSE partition.
2. Remove the FSC directory that belongs to the FSE partition.
fse --start