User`s guide

5.4 Removing a Storage Device SBB

CAUTION

Warm swap supports removing and replacing only one SBB at a time.

Should another SBB need to be swapped, the entire warm swap procedure

must be repeated.

The steps in this section must be followed in their exact order to be sure

of the following:

• Preserve data integrity (especially for devices with older SCSI

interface designs).

• Reduce chances of making a port unusable for a long period, which

can render several devices inaccessible.

• Prevent the controller from performing unpredictably.

Removing or replacing a storage SBB is reported to the controller or host by

the C_SWAP signal. The transition of this normally high signal to a low signal

indicates that a storage SBB has been removed or inserted. Upon receipt of this

signal, the controller can respond as described in Table 5–1.

Table 5–1 Controller Response to the C_SWAP Signal

Replacement Action Controller Response

Removing a storage device when data is not

being transferred

None

Removing a storage device during a data

transfer operation

Verify data validity

Installing a storage device Begin the storage device conﬁguration

process

Use the following procedure to replace a storage device SBB:

CAUTION

Be sure that the replacement device is the same model as the one being

replaced unless the system is reconﬁgured.

Be sure the Device Activity (green) LED on the SBB is out. Removing a

storage device SBB when the upper LED is on or ﬂashing can cause the

loss or corruption of data.

To prevent electrostatic discharge (ESD) damage to an SBB, do not

touch the SBB connector.

1. The device must be dismounted from the host before proceeding. (For

example, enter the DISMOUNT command if using the Open VMS operating

system.)

See the operating system documentation for procedures necessary for

dismounting a device.

Removal and Installation Procedures 5–3