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Deduplication rate

Chukwuemeka
Level 6
Partner Accredited

 

 

hello guys,

 

what would you say is the compression rate of using deduplication.  (e.g 50% or what)

 

My backups to a VTL is about 10TB, if i buy 20TB license for deduplication and a disk storage device, what would the total backup look like

if i have to re-run all the FULL BACKUPS to the new disk.

Do you think i would get a 50% reduction on the disk(ie instead of 10TB to the VTL would i now get 5TB to the disk).

 

Thanks

1 ACCEPTED SOLUTION

Accepted Solutions

Mark_Solutions
Level 6
Partner Accredited Certified

That really is a "how long is a piece of string" question.

It all depends on your data type

If you have a lot of encrypted of hig density multi media files then you may not get much in the way of de-dupe rates.

If your backups are the run of the usual run of the mill users docuements, SQL and Exchange databases etc. then i have seen 99 and 100% on the second run

If you do a lot of SQL logs backups then enable de-dupe compression to get any de-dupe on those at all

There are de-dupe assesment tools available so you may want to ask your Symantec partner for some advice or consultancy to do some testing for you

Hope this helps

View solution in original post

4 REPLIES 4

Mark_Solutions
Level 6
Partner Accredited Certified

That really is a "how long is a piece of string" question.

It all depends on your data type

If you have a lot of encrypted of hig density multi media files then you may not get much in the way of de-dupe rates.

If your backups are the run of the usual run of the mill users docuements, SQL and Exchange databases etc. then i have seen 99 and 100% on the second run

If you do a lot of SQL logs backups then enable de-dupe compression to get any de-dupe on those at all

There are de-dupe assesment tools available so you may want to ask your Symantec partner for some advice or consultancy to do some testing for you

Hope this helps

Marianne
Moderator
Moderator
Partner    VIP    Accredited Certified

Please go through the following manuals and URL's as part of dedupe planning deployment:

NBU Deduplication Guide   http://www.symantec.com/docs/TECH127071
NBU Deduplication: Additional Info  http://www.symantec.com/docs/TECH77575
http://eval.symantec.com/flashdemos/products/netbackup/dedupe_calc2/
http://www.symantec.com/docs/TECH159417 
http://eval.symantec.com/mktginfo/enterprise/white_papers/ent-whitepaper-global-dedupe-customer-results_12-2007_13561423.en-us.pdf

 

 

 

Omar_Villa
Level 6
Employee

Deduplication Rates are always tricky, if your data is a lot of DB's than the rate will be very low but if you have more files is very likely it will be way better, I always recommend if is budget posible to split the DB clients from the File clients between 2 different VTL's and only introduce a SIR or deduplication cluster to the environment dedicated to the file servers, some customers like that because they can control their deduplications and not just guess and the VTL environment for DB's because it doesnt gives much dedup rate they add more storage to the VTL using the Dedup cash.

Gautier_Leblanc
Level 5
Partner Accredited

Hello 

 

2 things :

  • 2:1 ration is very poor for deduplication. So, I think you will have more (unless you have only compressed or crypted files ;) ) but as everybody said, it is impossible to know deduplication rate before testing with your own data. It will also depend of the retentions of your backups.
  • I just want to remind you that license is evaluated on front data (data that is on your backup clients) and not your deduplication space. If you have 1TB of data on your clients, that have 2TB of disk space, and if your media server has 3TB of disk space for dedup, you will need of a 1TB license.

Regards.