Service manual

96022 Revision L 4-53
StorageTek Protected
Drive Tray Assembly
■ Drive Tray Assembly
The drive is behind the drive door at the rear of the library.
See “Drives” on page 1-14 and “Drive Interfaces” on page 1-16 for compatibility issues.
Note: The drive tray, serial cable, and DC power cable are part of the CRU and should
be returned with your old CRU.
From a software viewpoint, the top drive that is installed is Drive 0. If all eight
drives are installed, the top drive is Drive 0 and the bottom drive is Drive 7.
Drives are hot-swappable. This means they can be replaced without removing power from the library, and
the drives on the other SCSI buses can continue their data processing. This is possible because each drive
has a SCSI connector attached to the back of the drive. Only the drive that is being replaced must be
powered-off, and that drive’s SCSI bus must be quiesced.
If you are installing an SDLT 600 drive, make sure that Field Bill 102167 was
installed. The field bill replaces the internal fan finger guard with a perforated
steel plate to comply with emissions standards.
Use the following procedure to replace the drive.
Observe these precautions before beginning:
• Back up the server before removing the drive.
• If the drives are daisy-chained, stop all data processing on the channel to which the
drives are connected before disconnecting the drives.
• Make sure there is no activity on the SCSI bus before disconnecting the external
SCSI cables. Stop all processes on the client server.
• Make sure all signals are terminated at each end of the SCSI bus. Do not mix single-
ended and differential terminators.
If your external SCSI cables are long enough that they do not interfere with removing
and replacing the drive tray, you can swap drives without disconnecting the external SCSI
cables. If so, disregard the steps to remove those cables.
CAUTION:
Possible data loss or system problem: If you must disconnect the
external SCSI cables, make sure that you quiesce the system first (stop
all processes on the drives on the SCSI bus with the drive you are
replacing).
Note: You do not need to remove power from the library to remove a drive.