While an NDMP backup, the NDMP Data Server (NAS server) sends
the file history CatLog or metadata information to the NetWorker server. FH
metadata which is received from the NAS does not verify or modify by NetWorker
software.
The NetWorker uses the FH information to maintain proper
indexes and media database entries for the NDMP client backups.
Instead of virtual memory, the binaries nsrndmp_2fh and nsrdmpix are interact with the raw database. As a result,
memory requirements for this process are nominal.
The NetWorker server stores metadata updates in the \nsr\tmp directory
and commits the metadata to the client file index after the NDMP client backup completes.
Use the following formula to determine the required physical
space for the default \nsr\tmp directory:
2 * (144 + average file name length) * number of entries
in the file system
Please Note below thing: -
This formula must be
used for non-multi-streaming only.
For example:
For one million file entries with an average file name
length of 128, use this formula to
compute the required temporary swap space:
2 * (144 + 128) * 1,000,000 =
544 MB approximately
