User's Manual

108 Managing media
The scanning step is run for all FSE media in all FSE media pools that are assigned to a specified FSE
partition. This step determines the locations of valid and obsolete data on the already closed (full) and still
open FSE medium volumes, according to parameters that you define. It then records the scan results to the
Resource Management Database (RMDB). The scanning process is performed as a search through the
corresponding File System Catalog (FSC), therefore the FSE media themselves are not physically scanned.
The results of the scanning step are used in the copying step. This step copies all selected file generations
from the medium volumes being reorganized to open and empty medium volumes in the same FSE media
pool. The original volumes are then recycled and finally reinitialized. To reduce the number of drive load
and unload operations during the copying step, the data is copied to (open or empty) medium volumes on
the same medium, if any exist.
Note that the copying step of the reorganization process is not started until the scanning step has
completed, and vice versa.
Before running the copying step, you can review the results of the scan to decide which FSE medium
volumes or FSE media you actually want to reorganize. It is only useful to reorganize volumes with a high
enough proportion of obsolete data (that is, a high enough percentage of FSE slack space).
During execution of the reorganization process, FSE progressively shows status indicators (such as
scanned, in reorg, and recycled) to the medium volumes being reorganized. These indicators help
you detect and track the reorganization progress for a particular medium volume. You can display these
status indicators at any time with the following command:
The following table depicts the reorganization steps, a description of their tasks, the volume status
indicators that are set, and the corresponding FSE jobs.
Note that if migrations to a particular FSE medium volume occur after the volume has been scanned but
before the copying step has been triggered, the scanned status indicator of this volume is removed. The
copying step of the reorganization cannot be started for this volume until the volume is scanned again.
fsemedium --list [Barcode] --volume
Reorganization
step
Step tasks Status of medium volumes Job type
Step 1: Scanning [open/full] FSE reorganizational
scan job
1. Change the status of the FSE
partition to in scan.
2. Scan medium volumes for
obsolete data.
3. Write the scan results to the
RMDB.
[open/full], scanned
4. Change the status of the
scanned FSE partition back to
[enabled/mounted].
Step 2: Copying [open/full], scanned, in reorg FSE reorganization job
1. Copy selected data from the
medium volumes being
reorganized to open or empty
medium volumes.
2. Recycle the reorganized
medium volumes.
[open/full], scanned, in reorg,
recycled
3. Reinitialize the recycled
medium volumes.
empty