Digital Equipment EK-SFXXS-SG-003, Руководство по обслуживанию

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DECarray FRU Removal and Replacement 4–7
4.3 DSSI Interconnect Cables
These DSSI interconnect cables are external to the storage enclosure and
are used as follows:
• The 42-inch (PN BC21Q–3F) connects the enclosures to each other
and to magazine tape subsystems.
• The 70-inch (PN BC21R–5L) connects the enclosures to the storage
array I/O panel.
• The 108-inch (PN BC21Q–09) connects the storage array to the system
I/O panel.
Use the following steps to remove and replace an internal DSSI cable:
1. Perform an orderly shutdown of the host system and
all devices on
that bus. Remove ac power to the system(s).
2. Access the cables and the storage enclosure by opening the cabinet
doors.
3. Take the disk ISEs in all storage enclosures off-line:
CAUTION
Wear an ESD grounding strap at all times while handling the
storage enclosure or any of its FRUs.
a. Press and release all Ready buttons on the OCP of all storage
enclosures in the DECarray. Wait for the Ready LEDs to go out.
b. At the front of the storage enclosure, set the drive dc power
switches to off . The LEDs should go out to indicate that power
has been removed from the disk ISE.
4. At the rear, turn off the enclosure with the ac power switch on the
power supply.
5. Ensure that the ac power is removed from the host system(s).