DN Block Self Healing
The DN Block Self Healing feature allows the EPAP database to self heal when a command is executed
to create a new DN Block that conflicts with one of the existing DN Blocks. In addition to this primary
function, the feature also allows the defragmentation of the DN Blocks – split a DN Block into child
DN Blocks upon addition of conflicting DN Blocks and back into their parent DN Block upon deletion
of particular child DN Blocks.
This feature supports single DN Block conflict in the EPAP database.
1.
The DN Block Self Healing feature enables EPAP users to add new DN Blocks that conflict with
an existing DN Block in the EPAP database. The following changes occur when the self healing
EPAP database encounters this conflict:
• Pre-existing/conflicting DN Block is automatically deleted from the EPAP database.
• New DN Blocks are created successfully with new attributes.
• Old DN Block are split to create more DN Blocks for the range not covered by new DN block.
2.
Upon deletion of the new DN Block, the DN Block Self Healing feature returns a range of numbers
to the original DN Block, which was split as a result of addition of new DN Block. This splitting
action is described in the previous item.
Error Codes for DN Block Self Healing
These error codes are associated with the DN Block Self Healing feature.
•
PDBI_MULTI_DNB_CONFLICT - More than one conflicting DN Block was found in the EPAP
dtabase.
•
PDBI_DNB_SAME_PROPERTIES - A DN Block with the same properties exists in the database
and is a superset of the requested DN Block. Splitting eligibility of a DN Block is not considered a
property for this error.
•
PDBI_DNB_SPLIT_NOT_ALLOWED - The user is attempting to split an existing DN Block that
was specified at the time of its creation or update as ineligible for splitting.
•
PDBI_DNB_DLT_NOT_ALLOWED - The user is attempting to delete a fragment of a master
range while its subranges are present.
•
PDBI_DNB_PARENT_PROPERTY_MISMATCH - The user is attempting to delete fragments of
a master range which have differing attributes. Splitting eligibility of a DN Block is not considered
a property for this error.
Rules for DN Block Self Healing
The list of rules for the DN Block Self Healing feature are as follows:
• When the new DN Block is a subset of an already existing DN Block with different properties, the
old DN Block is split into either 2 or 3 new DN Blocks.
• An error is returned when the new DN Block has bdn and edn the same as an existing DN Block.
• An error is returned when the new DN Block has single DN address.
• An error is returned when the resulting DN Block has single DN address.
• An error is returned when more than one conflicting DN Block exists in the EPAP database.
• When the new DN Block is a subset of an existing block with same properties, the creation of new
DN Block is not allowed.
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910-6022-001 Revision A, March 2011
DN Block Self HealingProvisioning Database Interface Manual
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