details on bpduplicate

[netbackup_rooki]

Hi,

Can someone share their knowledge about bpduplicate? I would like to know what method it uses to duplicate the data? Also, when duplicating, is it reading the image contents and copying, uncompressing the tar files or is it using some kind of copy function to duplicate compressed images?

Thanks,

NBU_rookie

[mph999 · Accepted solution]

It uses bptm to carry out a back-to-back restore then backup.

Martin

[Marianne]

If compression was not enabled in the original backup, then no decompression/compression is taking place during duplication. as Martin said - it's a restore and backup all-in-one.

[netbackup_rooki]

just so i understand correctly,  since the drive A will do some compression "depending on data".. bpduplicate (bptm) will read the data from tape as it is restoring and then write to drive B.

so this would also means if duplicating to 2nd site via FAT WAN pipe and some other compression machnism is in place. this machnism should be able compress/uncompress the data during transport to remote site.

[Gdd]

Yes, if NetBackup images are not compressed (backed up files not compressed, and compression not activated at NetBackup client level), WAN compression is efficient and can reduce traffic on the WAN..