Query : Synth Backup

[Possible]

Synthetic backup is "A full Synthetic backup is in essence a consolidated duplication / synthesis of last full and subsequent incrementals"

Does it mean it does the duplication like normal duplication (Then how it completes in 1 minute for 100GB) ?

03/10/2014 12:08:21 - begin Database Query

03/10/2014 12:08:21 - end Database Query; elapsed time 0:00:00

03/10/2014 12:08:21 - begin Process Extents

03/10/2014 12:08:21 - estimated 122239002 kbytes needed

Where its refering ?

Does it write 100GB on disk like normal full ?

03/10/2014 12:11:08 - Info bpsynth (pid=27842) Performing Optimized Synthetic Operation

03/10/2014 12:11:08 - begin synthetic writer to XXX_1394409625

03/10/2014 12:11:08 - begin synthetic reader 1 for 1 extents from XXX_1394409624 on @aaaa7

03/10/2014 12:11:08 - sending extents 0-0 to reader 1

03/10/2014 12:11:08 - end Organize Readers; elapsed time 0:00:01

03/10/2014 12:11:08 - Info bptm (pid=11775) start

03/10/2014 12:11:08 - started process bptm (pid=11775)

03/10/2014 12:11:31 - end synthetic reader 1; read time: 0:00:23

Please explain above process as well.

[Marianne]

This is Optimized Synthetic  - not 'legacy' Synthetic.

Optimized Synthetic merely creates catalog entries for a Full from images already on dedupe disk.

Some reading matter:

https://www-secure.symantec.com/connect/blogs/optimized-synthetic-backups-taking-art-and-science-syn... 

http://www.symantec.com/docs/HOWTO89102 

http://www.symantec.com/docs/HOWTO36418

[Possible]

Does it acquires that full space on storage (imagelist mentions full size) for normal syntehhic backups...and refrenceing to fingerprins for optimized syntehic ?

[Marianne · Accepted solution]

I don't understand your question. .. Old/legacy/normal synthetic requires a read of last full plus subsequent Incrementals while physically writing the new full copy. Optimized synthetic simply updates dedupe fingerprint/catalog entries as well as image catalog entries on the master.

[Possible]

Perfect...Thats what i wanted...thanks maria for urgent help :)