ADSM-L

Re: [ADSM-L] Data Deduplication

2007-08-27 11:33:58
Subject: Re: [ADSM-L] Data Deduplication
From: Wanda Prather <wprather AT JASI DOT COM>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Mon, 27 Aug 2007 10:32:03 -0500
This is GREAT information, thanks much!


> Being that TSM does incremental, your de-dupe ratio will be lower than
> other Full / Incr backup products.  Here's a few lessons learned with TSM
> and a Diligent Protectier.
>
>         1) Do the best you can to put like data together. (ie all Oracle
> DB Backups go to the same de-dupe VirtualTape head (Repository),
>
>         2) Turn off all compression (Client and DB's)
>
>         3) Oracle Specific
>                 Do not use RMAN's Multiplexing in RMAN will combine 4
> Channels together and the backup data then will be unique every time thus
> not allowing for                        de-duping)
>                 Use the File Seq=1 (Then run multiple channels)
>
>         4) Do not Mix Windows and Unix data, It wont de-dupe well.
>
> We are seeing 10 and 15:1 on our Oracle and DB2, Exchange 12:1 (The DB's
> and Exchange all do Daily Full Backups)  In the regular Win env, we see
> 1.45 and 2:1 ick...
>
> Hope this helps.
>
> Regards,
>
> Charles
>
>
>
>
>
> Dirk Kastens <Dirk.Kastens AT UNI-OSNABRUECK DOT DE>
> Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
> 08/27/2007 02:31 AM
> Please respond to
> "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
>
>
> To
> ADSM-L AT VM.MARIST DOT EDU
> cc
>
> Subject
> Re: [ADSM-L] Data Deduplication
>
>
>
>
>
>
> Hi,
>
>> Writing a de-dupe backup product isn't easy.  EMC bought Avamar and
>> Symantec bought Data Center Technologies to get their respective
>> products. I don't know of any other de-dupe companies for IBM to
>> acquire, so they'll have to write their own.  That may take them a bit
>> longer.
>
> We're just testing a deduplication disk array from DataDomain with TSM.
> The compression ratio is much less than promised by the sales people.
> During the last 10 days of incremental backups we only achieved a ratio
> of 2.6:1. The disk array is very expensive and for the money you can buy
> more disks than you need without compression.
>
> --
> Regards,
>
> Dirk Kastens
> Universitaet Osnabrueck, Rechenzentrum (Computer Center)
> Albrechtstr. 28, 49069 Osnabrueck, Germany
> Tel.: +49-541-969-2347, FAX: -2470
>
>
>
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