User`s guide

StorageWorks Replacement Procedures
3.1 Replacing a Storage Device or a Power Unit
• Use the hot-swap method to replace power supplies only when there are two
power supplies in a shelf. You can remove the failed power supply while the
other furnishes the power.
• The warm-swap method is used when there are multiple shelves in a cabinet
and power is removed from a shelf to replace an SBB. When this method
is used, none of the devices on that shelf is operational until the power is
restored.
• The cold-swap method is normally used during initial installation or when
adding shelves. The power is removed from all shelves and all devices are
inactive. None of the devices is operational until the power is restored.
The removal or replacement of a storage SBB is reported to the controller or host
by the SWAP signal. The transition of this normally high signal to low indicates
that a storage SBB has been removed or inserted. Upon receipt of this signal, the
controller can respond as described in Table 3–1.
Table 3–1 Controller Response to SBB Replacement
Replacement Action Controller Response
Removing a storage device when data is not being transferred. None
Removing a storage device during during a data transfer
operation
Verify data validity.
Installing a storage device Begin the storage device configuration process.
Use the following procedure to remove or replace an SBB:
CAUTION
Be sure that the replacement device is the same model as the one being
replaced.
When removing or replacing an SBB, always use both hands to support
the weight of the SBB.
To prevent electrostatic discharge (ESD) damage to an SBB, do not
touch the SBB connector.
1. Press the two mounting tabs together (see Figure 3–1) to release the SBB.
2. Use both hands and pull the SBB out of the shelf.
3. Insert the replacement SBB into the guide slots and push it in until it is fully
seated and the mounting tabs engage the shelf.
4. After power is applied, observe the status LEDs for the following indications:
On a power SBB, both green status LEDs should be on.
On a storage SBB, the green device activity LED is either on, flashing, or
off. The amber device fault LED is off.
On a BBU, the amber charge LED is on.
3–2 StorageWorks Replacement Procedures