Server 2016 file server dedup

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Server 2016 file server dedup

Veeam Logoby johnhk » Tue Aug 08, 2017 9:12 am

Hi,
we have enable dedup for server 2016 (1.6TB), but Veeam still backup the full size (3.6TB).
Do it normal?

Thanks.
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Re: Server 2016 file server dedup

Veeam Logoby v.Eremin » Tue Aug 08, 2017 9:53 am

Have you enabled it inside backed up Virtual Machine?
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Re: Server 2016 file server dedup

Veeam Logoby johnhk » Tue Aug 08, 2017 9:55 am

Yes , Enable inline data deduplication
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Re: Server 2016 file server dedup

Veeam Logoby v.Eremin » Tue Aug 08, 2017 10:08 am

Inline data deduplication is a feature of backup server, not Windows Server 2016. So, where exactly did you enable the said feature?

If you enabled in on a backup server, what is the resulting size of backup file?

Otherwise, if data deduplication was enabled inside backed up Virtual Machine, then, that should not reduce the size of backup file, since Veeam Backup & Replication works on image level and doesn't care about data reduction technologies present inside the guest OS.

Thanks.
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Re: Server 2016 file server dedup

Veeam Logoby johnhk » Tue Aug 08, 2017 11:37 am

I've enable it on file server only , not the backup server.
So Veeam backup image level, VHD or vmdk present size instead on inside guest OS size right?
Thanks.
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Re: Server 2016 file server dedup

Veeam Logoby v.Eremin » Tue Aug 08, 2017 12:44 pm 1 person likes this post

Correct, more details can be found here. Actually, usage of deduplication inside Guest will result in increased size of incremental backups, as deduplication affects dramatically number of blocks changed. Thanks
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Re: Server 2016 file server dedup

Veeam Logoby nmdange » Tue Aug 08, 2017 5:00 pm 1 person likes this post

One thing to keep in mind, if you have dynamically expanding vhd/vmdk, the file may not shrink when you remove data within the VM. You might have to do a compact operation on the host to shrink the physical vhd/vmdk file.
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Re: Server 2016 file server dedup

Veeam Logoby ITP-Stan » Mon Aug 14, 2017 7:40 am 2 people like this post

I would not recommend deduplication on the fileserver.
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Re: Server 2016 file server dedup

Veeam Logoby mcclans » Mon Aug 14, 2017 3:44 pm 1 person likes this post

Why on earth would you not recommend dedup on the file server?
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Re: Server 2016 file server dedup

Veeam Logoby mkaec » Mon Aug 14, 2017 7:20 pm 2 people like this post

Deduplication has been awesome on our file servers. The average space savings is 33%. But, it is not good on the servers backed up by Veeam because garbage collection dramatically increases the changed blocks, and thus the size of the incremental backups. We have dedup active on some servers being backed up by Windows Server backup and it has been working great there.
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