IBM Storwize V7000 Troubleshooting And Maintenance Manual page 48

The recommended actions for these alerts guide you in correcting the situation.
Clear bad blocks by deallocating the volume disk extent, by deleting the volume or
by issuing write I/O to the block. It is good practice to correct bad blocks as soon
as they are detected. This action prevents the bad block from being propagated
when the volume is replicated or migrated. It is possible, however, for the bad
block to be on part of the volume that is not used by the application. For example,
it can be in part of a database that has not been initialized. These bad blocks are
corrected when the application writes data to these areas. Before the correction
happens, the bad block records continue to use up the available bad block space.
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Storwize V7000: Troubleshooting, Recovery, and Maintenance Guide
Table 18. Bad block errors (continued)
Error code
1225
Description
The system has failed to create a bad block
because the system already has the
maximum number of allowed bad blocks.