Nortel DMS-10 Series Installation, Operation And Maintenance Manual page 499

Procedure 6-20
Version number Missing Recovery
Step Description
Note that the number of PRIMARY blocks in the new index has changed from 42 to 78.
This is an increase of 36 blocks. This is correct because the index file now correctly
includes version 82 (which contains 36 blocks of PRIMARY AMA). Since the BMC is
actively collecting AMA data, the number of blocks in the index may increase by more
than the indicated difference of 36 blocks.
19
Display the closed AMACRD versions in the new index. Verification that the AMACRD
versions are now in the proper order (sequential and contiguous) can be performed by
displaying the closed AMACRD files in the index.
>IDXMAINT DIR CLOSED AMA 200 (cr)
Example response:
VS 81: 3451 BLKS, 6 PRIMARY, AMA SEQ #00000000
VS 82: 36 BLKS, 36 PRIMARY, AMA SEQ #00003451
VS 83: 36 BLKS, 36 PRIMARY, AMA SEQ #00003487
This concludes the recovery procedure for version missing from index, but is on disk.
Sequence numbers not incrementing properly
Sequence numbers should always be sequential and continuous. They should
increment from a lower number toward a higher number and should never
decrement. The beginning sequence number for an AMACRD file can be
calculated by adding the beginning block number to the number of blocks
from the previous sequence number.
If version 106 of an AMACRD file has a starting sequence number of 602747
and contains 2968 blocks, then version 107 should have a starting sequence
number of 605715 (the sum of version 106's beginning sequence number,
602747, plus the 2968 blocks in version 106).
Recognition
If sequence numbers are decrementing instead of incrementing, or if the
sequence number is not the sum of the beginning sequence number of the
previous version and the number of blocks in the previous version, then
corruption has occurred.
BMC II BISYNC Operation, Administration, and Maintenance Guide BMCB001 and up
Section 060-INDP-610 Maintenance Procedures Guide 6-61
(Sheet 2 of 2)