![](/images/backgrounds/285955/hp-storageworks-file-system-extender-fse-users-manual-156180114x1.png)
actual layout of the remigrated data on FSE media differs from the original data layout on the unreadable medium.
Figure 23 Recreating a copy of damaged migrated data
Media Pool 2F2 | F3 | F4' | F4'' | F5 | F6 |
Media Pool 4
F3 | F4 | F5' | F5'' F6 | F3 | F4 | F5' | F5'' |
If alternative migrated copies of the unrecallable data exist in both tape and disk media pools, the redundant copy is recreated from the data stored in the disk media pool. By using the disk media pool, as many FSE drives as possible remain available for other FSE processes, such as migration and recall. You can define the total number of drives that can be simultaneously used for redundant copy recreation (for example, when several media are damaged) with the FSE partition configuration variable SystemMaxNumDrivesMaint. Note that this variable affects all types of maintenance jobs.
NOTE: The redundant copy recreation process operates on a
In cases where no alternative migrated copies of the unreadable data exist, a warning (the unreadable data belongs to a
NOTE: You are not restricted to creating a redundant copy of an FSE medium only when the medium is already damaged and has the status set to unusable. You can also perform this action with a
After creating a redundant copy of an unreliable or a “good” (usable) medium, two valid (readable) data copies exist in the same FSE media pool. Note that you cannot have more than two valid copies of the same data in the same media pool.
CAUTION: If you use the command fsemedium
114 Managing media