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The library graphic on the GUI Library Dashboard shows which module has the faulty supply. Power
Supplies do not have a UID, but the UID for the module with the failing power supply can be turned on
to identify the location of the failing supply. If a module has a single power supply, that it needs to be
replaced.
The lights on the back of the power supply indicate which one is in a fault condition. The White LED and
Green LED are lit, when the power supply is operating normal. The White LED indicates that the AC power
cord is plugged in and the power supply is getting AC power. The green LED indicates that the power
supply is producing DC power.
If two redundant power supplies are installed in a module, the library cannot determine which supply has
the fault. In this case, the lights on the power supplies must be used to determine which one has the fault.
If the White LED is off, make sure that the power supplies are inserted properly and double check AC
power source and power cords. Replace the power supply if the White light does not come on when the
power cord is plugged in.
When the White LED is on and the library is powered on, the Green LED should also be on. If it does not,
replace the power supply.
Library Element Numbering Details
Library Element Numbering
Element numbering provides a unique identifier for important library elements like modules, cartridge
slots and drives. These numbers are used in library interfaces and software to locate a particular library
element. Some library elements are components that can be replaced like drives and modules. Some
elements are not individual components, like slot locations for cartridges.
The following library elements are numbered:
• Modules (base and expansion)
• Cartridge Slots (storage and I/O)
• Drives
Library Controller cards and power supplies are not numbered separately. They are identified by the
module in which they reside. There may be two power supplies inside a module, an upper and a lower
supply. The firmware does not provide any identification to differentiate between an upper and lower
power supply.
There are 3 different numbering systems used to identify elements in the library:
1. Logical Numbering - Referred to as "Logical ID" and abbreviated as "Log ID" or just "ID". This is
the simplest and most commonly used system for identifying library elements in logs and library
interfaces. Elements are numbered from the bottom up in sequential fashion, as they appear in the
configured library. Numbering starts with 1, not zero.
2. Physical Numbering - Abbreviated as "Phy Num" or "PNUM". PNUMs are also assigned from the
bottom up, starting with 1, but are based on an element's position in reference to the base module
in a maximum library configuration. Elements in the base module will have default PNUMs. Elements
above the base module will have higher PNUMs. Elements below the base module will have lower
PNUMs. Since 21U libraries and 48U libraries have different maximum configurations, their PNUMs will
be different.
Note: PNUMs are for software internal use only. They are used in applications where each element
needs a stable identification that does not change when components or modules are added to or taken
out of the library. They may be listed with the Log ID as a diagnostic aid in library logs or interfaces
3. SCSI Element Addressing - Referred to as "Element Addresses". Element addresses are a standard
numbering system defined in SCSI specifications that help software applications identify elements in
the tape library. Element Addresses are derived from PNUM but are altered as defined by the SCSI
specifications. There are SCSI element addresses for tape drives, storage slots, and Input/Output (IO)
mailbox slots.
98 IBM TS4300 Tape Library Machine Type 3555: User's Guide
IBM Confidential
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