Digital Equipment StorageWorks UltraSCSI DS-BA370 Series, User Manual

Page: 144 / 186

Storage Devices
7–8 UltraSCSI RAID Enclosure
____________________ Caution ____________________
Although the HSZ70-series controllers support hot swap, other
controllers do not. If you are not positive that your SCSI
controller supports hot swap, DIGITAL recommends using
warm swap to protect the integrity of your data.
Read the array controller documentation to determine which
array controller-supported swap method to use.
________________________________________________
You can use hot swap to remove and replace SBBs from a system that is on
line and active.
Warm Swap
When you perform a warm swap, power is present on the SBB enclosure
connector and there is no data on the bus. Before you perform a warm swap
you must quiesce the bus at the array controller and observe the amber
status LED on the SBB and ensure that it is not flashing.
____________________ Caution ____________________
You can perform a warm swap only when the green device
activity LED is
OFF
.
________________________________________________
Cold Swap
When you perform a cold swap, neither power nor data is present on the
SBB enclosure connector. This requires turning O
FF
the enclosure power in
all the UltraSCSI RAID subsystem enclosures.