CBT on CSV

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CBT on CSV

Veeam Logoby volumeshadow1 » Mon Jun 16, 2014 8:35 am

Hi,

I´d like to know how veeam is gathering the changed blocks? Is it a Live Filesystem Filter?
Where does Veeam store its Changed Block Tracking Information? Is it a File on a Node?
How does Veeam incorporate with CSV? Does it track on each Node and consolidate the data?
Do i have to consider any extra IO´s while CBT is active?
Do i have to increase storage design because of CBT (If its a File?)

It would be cool to shed some light on this.
Thanks
volumeshadow1
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Re: CBT on CSV

Veeam Logoby Vitaliy S. » Mon Jun 16, 2014 9:45 am

Hello Peter,

Please check out our on-line help center to get answers for these questions > http://helpcenter.veeam.com/backup/70/h ... ghtsub=CBT

Let me know if you still have any questions. Thank you!
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Re: CBT on CSV

Veeam Logoby volumeshadow1 » Mon Jun 16, 2014 10:49 am

Hi Vitaliy,

yep, that answered most questions.
Could you tell me anything about filegrowth related to VHD growth (do you compress the data?)
And what about Performance (IOPS) - will there be some caching in RAM and aggregated writes to .ctp files, or will each write to CSV gets an equal write to .cpt?
Thanks!
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Re: CBT on CSV

Veeam Logoby foggy » Mon Jun 16, 2014 11:10 am

Each 4MB of data require 2 bytes in the .ctp file (no compression). Data are cached in memory prior to be written into .ctp files.
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Re: CBT on CSV

Veeam Logoby volumeshadow1 » Tue Jun 17, 2014 8:12 am

thank you for detailed answers
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Re: CBT on CSV

Veeam Logoby Gostev » Tue Jun 17, 2014 9:51 am

Just to add to that, our changed block tracking filter driver has been officially certified by Microsoft last month.
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