Partial disk failure

Partial disk failures when you have chosen not to implement hardware protection against media failures and the course of action to correct this problem.

If the disk has only partially failed and you have chosen not to implement hardware protection against media failures, the steps to restore your data depends on whether you have used replication. If you have replicated neither your data nor metadata, you will need to issue the offline version of the mmfsck command, and then restore the lost information from the backup media. If it is just the data which was not replicated, you will need to restore the data from the backup media. There is no need to run the mmfsck command if the metadata is intact.

If both your data and metadata have been replicated, implement these recovery actions:

Unmount the file system:
```
mmumount fs1 -a
```
Delete the disk from the file system:
```
mmdeldisk fs1 gpfs10nsd -c
```
If you are replacing the disk, add the new disk to the file system:
```
mmadddisk fs1 gpfs11nsd
```
Then restripe the file system:
```
mmrestripefs fs1 -b
```
Note: Ensure there is sufficient space elsewhere in your file system for the data to be stored by using the mmdf command.