HP StorageWorks P2000 - G3 MSA Array Systems

HP StorageWorks P2000 G3 MSA System FC User Guide 33
Testing enclosure connections
Power cycling procedures vary according to the type of power supply unit (PSU) provided with the
enclosure. Some legacy enclosure models are equipped with PSUs possessing power switches; whereas
P2000 G3 MSA System enclosures use PSUs that have no power switch. The following section, Powering
on/powering off, describes power cycling procedures relative to different types of PSUs installed within
enclosures.
NOTE: Once the enclosures’ power-on sequence succeeds, the storage system is ready to be connected to
hosts, as described in Connecting the enclosure to data hosts on page 41.
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 installation sheet.
NOTE: New AC power supply units do not have power switches. Switchless PSUs power on when
connected to a power source, and 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 the 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 LED descriptions on page 57 for descriptions of LED behavior.
• 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 within the enclosure.
For controller and expansion enclosures configured with the switchless AC PSUs, refer to the procedure
described under Switchless AC PSU below. For procedures pertaining to a) controller enclosures configured
with DC PSUs, or b) previously installed expansion enclosures featuring power switches, see DC and AC
PSUs with power switch on page 34.
Switchless AC PSU
Controller and expansion enclosures configured switchless PSUs rely on the power cord for power cycling.
Connecting the cord from the PSU power cord connector to the appropriate power source facilitates power
on; whereas disconnecting the cord from the power source facilitates power off.