Installation guide

C.2 Conversion Procedure

C.2.2 Split-Bus to Through-Bus Conversion

Use the following steps only if you are converting an Sx72 storage enclosure

in position 3 or 5 of an Sx300 storage array from single-host to dual-host

conﬁguration. Sx72 storage enclosures in position 3 and 5 must be converted to

through-bus mode.

CAUTION

Maintain ESD precautions at all times. Before performing the following

steps, locate the ESD strap in the ESD pouch at the bottom of the front

door.

To maintain stability, extend only one Sx72 storage enclosure or

magazine tape subsystem on the slide mounts at a time.

1. Remove the OCP by ﬁrmly grasping the right and left side of the OCP and

pulling the OCP straight off.

2. Loosen the four captive slide assembly screws. At the rear, push the inner

assembly out until the drawer locks in the service position.

Note

Do NOT completely remove the Sx72 inner drawer assembly from the

extrusion tube.

3. Reconﬁgure the transition termination module (TTM) for through-bus mode

by ﬁrst moving the small black jumper to the through-bus terminals. Then

move the cable connector from J3 to J5, and the cable connector from J2 to

J4 as shown in Figure C–3.

4. Push the Sx72 inner assembly back into the extrusion tube. To prevent

pinching any cables, be sure that all cables are dressed correctly.

5. Tighten the four captive slide assembly screws.

6. Set the DSSI ID number switches behind the OCP front door of positions

3 and 5 to match those in positions 1, 2, 4, and 5. See Figure C–4 and

Table C–1.

7. Replace the OCP by lining up the taps on the back of the OCP with the

slots on the front of the storage enclosure. Firmly press the right and left

side of the OCP.

C–6 Converting a Single-Host Conﬁguration to a Dual-Host Conﬁguration