Chapter 5. Operation; Powering On/Powering Off - IBM Medium J11 Hardware Installation And Maintenance Manual

Chapter 5. Operation

Powering on/powering off

About this task
Before powering on the enclosure system, make sure that all modules are firmly seated in their correct
slots. Verify that you have successfully completed the sequential instructions in the "Installation
checklist" on page 25 table. Once you have completed these steps, you can access the management
interfaces to complete the system setup.
CAUTION: Do not operate the enclosure system until the ambient temperature is within the
specified operating range described in the "Environmental requirements" on page 71 section. If
the drive modules have been recently installed, make sure they have had time to adjust to the
environmental conditions before they are used with production data for I/O.
Procedure
1. Power up the system by connecting the power cables from the PSU to the PDU. The System Power LED
on the front panel should be lit green when the enclosure power is activated.
See the "Power cord connection" on page 42 section.
2. Power the system down by disconnecting the power cord from the power supply module.
3. When powering up, make sure to power up the enclosures and associated data host in the following
order:
• Expansion enclosures first.
This ensures that the 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,
back and top of the enclosure are amber—the power-on sequence is complete, and no faults have
been detected.
– See "Front panel LEDs" on page 14.
– See "Rear panel LEDs" on page 16 and figures/tables for rear panel CRUs.
– See "Top panel LEDs" on page 21 and figures/tables for top panel CRUs.
• Controller enclosure next, if an RBOD is used. Not applicable to server attached Disk Enclosure
configuration.
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: When powering off, you will reverse the order of steps used for powering on.
Important: If main power is lost for any reason, upon restoration of power, the system will restart
automatically.
Note: See "Front panel LEDs" on page 14 for details about front panel LEDs and related fault
conditions.
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Copyright IBM Corp. 2020, 45