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Clarification on SLP duplications

Created: 26 Sep 2012 • Updated: 06 Oct 2012 | 4 comments
Suganthi's picture
This issue has been solved. See solution.

Hi All,

I have Solaris master server and have slps in place for backup.

Master server is a 4 node cluster, 2 in Datacenter1( DC1) and other 2 in Datacenter2(DC2)  for disaster recovery.

SLP is configured with a backup and 3 duplications as below

Backup ->  DC1 disk -> Expire after duplictaion

Duplictaion-> DC1 tape -> Fixed 35 days

Duplication -> DC2 disk -> Expire after duplication

Duplication -> DC2 tape-> fixed 35 days

Please let me know if duplications takes palce in order as its configured and is this configurtaion correct.

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Yasuhisa Ishikawa's picture

I can not determine if this SLP ducplication is configured in series or in parallel from this text.

Please post output of "nbstl -L" and "bpstulist -U".

Authorized Symantec Consultant(ASC) Data Protection in Tokyo, Japan

Suganthi's picture

I have attached the outputs. Also I have got my query cleared from the output but can you please tel me about duplications in series and parallel.

Duplication.txt 4.25 KB
Yasuhisa Ishikawa's picture

SLP is configured as serial duplication.

Backup will be taken into dc1_dd first, then duplicate images from dc1_dd to dc1_tape.
After first duplication is completed, images will be duplicated from dc1_tape to dc2_dd.
Finally, duplicated images in dc2_dd will be duplicated from dc2_dd to dc2_tape.

I assume you are using Data Domain as dc1_dd and dc2_dd.
Why don't you configure duplication from dc1_dd to dc2_dd? With current configuration, backup images are rehydrated when they are duplicated from DD to tape. So, data will be rehydrated once, and un-deduplicated data will be transfered from dc1_tape to dc2_dd.
If you have replication license on both DD and you configure duplication from dc1_dd to dc2_dd directly, you can duplicate data from dc1_dd to dc2_dd without rehydration. Only unique data chunks which does not held in dc2_dd will be send.

Authorized Symantec Consultant(ASC) Data Protection in Tokyo, Japan

Suganthi's picture

Thanks Yasuhisa ! I am doing the changes in my environment considering your valuable suggetsion  :-)