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Volume Deduplication BEFORE migration ?


roykato
(@roykato)
Joined: 1 year ago
Posts: 3
Topic starter  

Hi,

 

I have a big amount of data to transfert for a migration to Zimbra 9 (about 1Tb)

 

Is it safe to perform deduplication before migration ? Has it should reduce the amount of data but i'm scared that it will end up in a loss of data.

 

Regards


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linganna.palepu
(@linganna-palepu)
Joined: 11 months ago
Posts: 16
 

Hello Roykato,

Please note that the "zxsuite powerstore doDeduplicate VOLUMENAME" will deduplicate files in the volumes to reduce the used space, and will not remove duplicated items from a mailbox.

You can find more information about item deduplication in our Zextras' guide https://docs.zextras.com/zextras-suite-documentation/latest/powerstore.html#_item_deduplication_and_zextras_powerstore

I'll be glad to answer any further questions.


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Matt
 Matt
(@matt)
Joined: 3 years ago
Posts: 31
 

Hello @roykato,

may I ask you how you intend to perform the migration?

If you're going to perform an incremental migration, which is the most advisable way to migrate the data to different infrastructure, the deduplication operation will not impact in any way as the Zextras Backup is natively deduplicated.

Otherwise, if you're going to perform a different migration, please consider that the ZxPowerstore deduplication will substitute identical blobs with hard links in the file system.


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roykato
(@roykato)
Joined: 1 year ago
Posts: 3
Topic starter  

@matt Hi,

 

It is a complete migration from 8.0.6 to 9 from an old server to a new one.

 

I've managed to reduce to 900Gb by asking and helping end users to remove old and unused emails.

I plan to monitor a bit more the usage before migrating and the project is in current standby because we are trying to get a faster network to speedup this migration.

 

If in understood correctly your message, in the case of old server to new server migration Volume Deduplication is not recommanded ?

 

Regards

 


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Klug
 Klug
(@klug)
Joined: 11 years ago
Posts: 25
 

Be careful on the restore/import side: you'll need the NON-deduplicate space.

Then, once everything is restored/imported, you'll be able to run a deduplication process to reduce space use.


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roykato
(@roykato)
Joined: 1 year ago
Posts: 3
Topic starter  

@klug Thanks so I will wait the end of the migration before running a deduplication.

 

How does that work if someone as run a deduplication in the past and need to do a migration to a new server ? Does that mean lossing deduplicated blobs ? 

 

I'm curious to know what happend in a case like this

 

Regards


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Klug
 Klug
(@klug)
Joined: 11 years ago
Posts: 25
 

The backup/restore process doesn't care if the server is dedupilicated daily or if it never was deduplicated.
It doesn't take care of the powerstore/HSM either if you have some.

The backup uses its own deduplication to use the least space possible.

The restore process restores each mallbox "flat", without any deduplication.
And in the primary volume (not using powerstore/HSM).


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