ADSM-L

Re: [ADSM-L] FW: [ADSM-L] Should CBT be enabled before using TSM for VE to save space?

2013-07-08 21:17:21
Subject: Re: [ADSM-L] FW: [ADSM-L] Should CBT be enabled before using TSM for VE to save space?
From: "Stackwick, Stephen" <Stephen.Stackwick AT ICFI DOT COM>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Tue, 9 Jul 2013 01:15:09 +0000
According to this:

http://www-01.ibm.com/support/docview.wss?uid=swg21641914&myns=swgtiv&mynp=OCSS8TDQ&mync=E

TSM4VE backs up the whole disk. And that's been my experience.

Steve

STEPHEN STACKWICK | Senior Consultant | 301.518.6352 (m) | Stephen.Stackwick AT 
icfi DOT com | icfi.com
ICF INTERNATIONAL | 410 E. Pratt Street Suite 2214, Baltimore, MD 21202 | 
410.539.1135 (o)

> -----Original Message-----
> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf
> Of Robert Ouzen
> Sent: Monday, July 08, 2013 8:58 AM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: [ADSM-L] FW: [ADSM-L] Should CBT be enabled before using TSM for
> VE to save space?
> 
> Hi Wanda
> 
> No quite sure at least in Vsphere 5 (maybe Vsphere 5.1) , I always check  
> with the
> command: dsmc show VM all  and the parameter :  changeTracking: Off
> 
> About the first backup will take only the USED space , at least in my 
> environment
> some machines works fine  but some others backup the ALL space !!!
> 
> Best Regards
> 
> Robert
> 
> -----Original Message-----
> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf
> Of Prather, Wanda
> Sent: Monday, July 08, 2013 3:47 PM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: Re: [ADSM-L] Should CBT be enabled before using TSM for VE to save
> space?
> 
> If your VM's were created in VSphere 5, CBT will be on by default.
> 
> My understanding is that either way (starting with CBT on or off), you should
> only get USED space on the first backup.
> 
> 
> -----Original Message-----
> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf
> Of Michael Roesch
> Sent: Monday, July 08, 2013 4:29 AM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: [ADSM-L] Should CBT be enabled before using TSM for VE to save
> space?
> 
> Hi there,
> 
> I've read here http://www-01.ibm.com/support/docview.wss?uid=swg21608413
> that TSM for VE is using "content-aware" backup, if CBT is enabled. It also 
> says
> that TSM for VE will enable CBT after the first backup.
> 
> So I'm wondering if enabling CBT before performing the first backup would
> make TSM for VE backup only the used blocks (i.e. used space) and hence would
> save space on the storage pool?
> 
> Or would TSM for VE still backup the full VMDK, including possible lots of 
> unused
> space inside it on the first backup?
> 
> Regards,
> Michael