Testing Enclosure Connections; Powering On/Powering Off; Ac Power Supply - HP MSA 2040 User Manual

Testing enclosure connections

NOTE: Once the power-on sequence for enclosures succeeds, the storage system is ready to be
connected to hosts, as described in

Powering on/powering off

Before powering on the enclosure for the first time:
• Install all disk drives in the enclosure so the controller can identify and configure them at power-up.
• Connect the cables and power cords to the enclosures as explained in the quick start instructions.
NOTE: MSA 2040 controller enclosures and drive enclosures do not have power switches (they are
switchless). They power on when connected to a power source, and they power off when disconnected.
• Generally, when powering up, make sure to power up the enclosures and associated data host in the
following order:
• Drive enclosures first
This ensures that disks in each drive enclosure have enough time to completely spin up before being
scanned by the controller modules within the controller enclosure.
While enclosures power up, their LEDs blink. After the LEDs stop blinking—if no LEDs on the front
and back of the enclosure are amber—the power-on sequence is complete, and no faults have been
detected. See
• Controller enclosure next
Depending upon the number and type of disks in the system, it may take several minutes for the
system to become ready.
• Data host last (if powered down for maintenance purposes)
TIP: Generally, when powering off, you will reverse the order of steps used for powering on.
Power cycling procedures vary according to the type of power supply unit included with the enclosure. For
controller and drive enclosures configured with the switchless AC power supplies, refer to the procedure
described under
with DC power supplies, or b) previously installed drive enclosures featuring power switches, see
AC power supplies equipped with a power switch" (page
IMPORTANT:
power cords supported by MSA 2040 enclosures.

AC power supply

Enclosures equipped with switchless power supplies rely on the power cord for power cycling. Connecting
the cord from the power supply power cord connector to the appropriate power source facilitates power
on, whereas disconnecting the cord from the power source facilitates power off.
28 Installing the enclosures
"Connecting the enclosure to data hosts" (page
"LED descriptions" (page 79)
AC power supply below. For procedures pertaining to a) controller enclosures configured
See "Power cord requirements" (page 92)
for descriptions of LED behavior.
29).
and the QuickSpecs for more information about
33).
"DC and