Note on shared memory and NetBackup for NDMP
The following tables describe how NetBackup for NDMP uses shared memory.
Table: NetBackup for NDMP and number of data buffers shows the effect of NUMBER_DATA_BUFFERS according to the type of NDMP backup.
Table: NetBackup for NDMP and number of data buffers
Type of NDMP backup | Use of shared memory |
|---|---|
Local NDMP backup or three-way backup | NetBackup does not use shared memory (no data buffers). NUMBER_DATA_BUFFERS has no effect. |
Remote NDMP backup | NetBackup uses shared memory. You can use NUMBER_DATA_BUFFERS to change the number of memory buffers. |
Table: NetBackup for NDMP and size of data buffers shows the effect of SIZE_DATA_BUFFERS_NDMP according to the type of NDMP backup.
Table: NetBackup for NDMP and size of data buffers
Type of NDMP backup | Use of shared memory |
|---|---|
Local NDMP backup or three-way backup | NetBackup does not use shared memory (no data buffers). You can use SIZE_DATA_BUFFERS_NDMP to change the size of the records that are written to tape. Use SIZE_DATA_BUFFERS_DISK to change record size for NDMP disk backup. |
Remote NDMP backup | NetBackup uses shared memory. You can use SIZE_DATA_BUFFERS_NDMP to change the size of the memory buffers and the size of the records that are written to tape. Use SIZE_DATA_BUFFERS_DISK to change buffer size and record size for NDMP disk backup. |
The following is a brief description of NDMP three-way backup and remote NDMP backup:
In an NDMP three-way backup, the backup is written to an NDMP storage unit on a different NAS filer.
In remote NDMP backup, the backup is written to a NetBackup Media Manager-type storage device.
More information is available on these backup types.
See the NetBackup for NDMP Administrator's Guide.