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baber
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Use per-VM backup files check box and Deduplication

Post by baber »

Dear all
Hi

in your veeam user guide document on page 238 mentioned :

with select the Use per-VM backup files check box Veeam Backup & Replication will write VM data to the backup repository in several streams, which will improve the backup job performance. However, in this case Veeam Backup & Replication will not deduplicate data between VMs added to the job. For more information, see Per-VM Backup Files.

now i want to know if i select this item (Use per-VM backup files check box) on repository veeam could not do duplicate for that vm backup ?

BR
Babak

PTide
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Re: Use per-VM backup files check box and Deduplication

Post by PTide »

Hi,

Setting that checkbox will prevent deduplication between different VMs in the backup chain. Virtual disks belonging to the same VM will be still deduplicated.

Thanks

baber
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Re: Use per-VM backup files check box and Deduplication

Post by baber »

thanks
but what does your mean from between different vms in the backup chain. and virtual disks belong to same vm

because i just create one job with many vms for example my job consist of 5 vms (vm1......vm5)
is that your means deduplication will be accomplish for vm1's backup chains (full , incremental backups)
and will not deduplicate between vm1 and vm2 backups ?

BR

PTide
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Re: Use per-VM backup files check box and Deduplication

Post by PTide »

means deduplication will be accomplish for vm1's backup chains (full , incremental backups) and will not deduplicate between vm1 and vm2 backups ?
That's right.

Thanks!

baber
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Re: Use per-VM backup files check box and Deduplication

Post by baber »

but i confused why you say 2 kind of deduplication mode what is difference between deduplication in one backup chain and deduplication among VMS ? because finally deduplication is doing and will be dgrade size of vm backup

Is that correct ?

BR
Babak

PTide
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Re: Use per-VM backup files check box and Deduplication

Post by PTide » 1 person likes this post

Deduplication for one chain does not get rid of the duplicates in other chains:

VM1 Chain: [AB] - [BC] - [ABC] - [AD] --> ABCD
VM2 Chain: [BB] - [A] - [BDD] --> ABD

Deduplication with a single chain:

[AB][BB] - [BC][A] - [ABC][BDD] --> ABCD

Thanks!

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