StorageTek L40 Series, Инструкция по эксплуатации, Страница: 21 / 30

96006 Ninth Edition (I) 1-1
1
Drive CRU Replacement
This chapter describes how to replace the drive CRU. The CRU consists of the
drive, the drive tray, the serial cable, and the drive power cable. Return these
components with your old CRU.
The drive CRU is behind the drive door at the rear of the library.
From a software viewpoint, the top drive that is installed is Drive 0. For an L40,
if all four drives are installed, the top drive is Drive 0 and the bottom drive is
Drive 3. For an L80, if all eight drives are installed, the top drive is Drive 0 and
the bottom drive is Drive 7. If drives are installed only in some of the slots, for
example, in the two middle slots, the top drive installed is Drive 0 and the drive
beneath it is Drive 1.
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.
You must follow the precautions listed below.
If you are installing an SDLT 600 drive, make sure that Field Bill 102181 for the
L40 or 102167 for the L80 was installed. The field bill replaces the internal fan
finger guard with a perforated steel plate to comply with emissions standards.
CAUTION:
Possible drive damage: Read the instructions in “Safety” on page xi
before beginning.
Use the following procedure to replace the CRU.
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 host.
• Make sure all signals are terminated at each end of the SCSI bus. Do not
mix single-ended and differential terminators.