HP Surestore Disk Array 12h and FC60 - Manual (Page 408)

408 Controller Enclosure Modules
Once the disk enclosure is powered up, check the status of the disk modules using one of
the software management tools. Initially the disk modules status will be either “write
failed” or “no_response.” Eventually, all the disk modules should return to “replaced”
status. Once this occurs, the disk array will perform a rebuild (a result of I/O occurring
during the period the enclosure was powered off). The disk array will operate at reduced
performance until the rebuild is completed.