Starting disk service

Before exchanging a disk unit, you must attempt to save customer data. This procedure directs you to the correct recovery procedure to use when attempting to save customer data.

1. Choose one of the following options:
   • If your system utilized a hot spare for the failing disk unit, go to Exchanging a disk unit and configuring it as a hot spare.
     Note: If SRC xxxx9031 was logged in the Product Activity Log around the time of the disk unit failure, this indicates that a hot spare disk unit was utilized.
   • If your system has mirrored protection for the failing disk unit, go to Exchanging a disk unit with mirrored protection. This ends the procedure.
   • If your system has device parity protection for the failing disk unit, go to Exchanging a disk unit with device parity protection. This ends the procedure.
     Note: If you are not sure whether the system has mirror protection or device parity protection, see Determine storage protection status.
   • If neither of the above conditions apply, then continue with the next step.
2. You are exchanging the disk unit. Choose from the following:
   • To save the data by copying to tape, go to Saving data and initializing the disk unit. This ends the procedure.
   • To save the data by copying to another disk, go to Initializing the disk unit and copying to disk. This ends the procedure.