Differences between the MDB, DRDB, FDB0, and FDB1 databases

DRDB: It is a dynamic database stored in the dynamic RAM and is powered by batteries.
MDB: It is a static database stored in the power-off RAM and is lost upon a power failure.
FDB0 and FDB1: They are permanent databases stored in FLASHROM.
In normal cases, NE configuration data is stored in both the MDB and DRDB databases.
Upon a restart from a power failure, data in the MDB database is lost. Therefore, the system control board first restores data from the DRDB database. If there is no data in the DRDB database (for example, the batteries are used up or fail), the system control board first restores data from the FDB0 and FDB1 databases.

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