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Disk space issue with VDPA

Posted on 2014-09-18
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Last Modified: 2014-09-30
I have VDPA setup to backup 8 vms... For some reason I have had the jobs running for a few weeks and it is saying there is only 290GB free out of 2TB.. I thought this was going to dedup everything and not use a lot of space. The dedup space is saying 1.8TB..
I setup the diskl on the vdpa vm appliance to 4 disk,, 100Gb and the other 3 are 1TB each
What am I doing wrong with the backup jobs that it is using so much space?
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Question by:vmich
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Author Comment

by:vmich
ID: 40331024
Another item to mention is that the vms being backed up have disk size all together of 1.1TB of which there not using all of that space...
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Expert Comment

by:gheist
ID: 40331032
Snapshots keep old version of changed disk blocks. The longer they are kept the bigger they grow.
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Author Comment

by:vmich
ID: 40331050
well I had them set for 60 days but just changed them now to 30 days and told it to keep them until 9-19-14 which is tomorrow. So will it delete the space tomorrow and free it back up?
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Author Comment

by:vmich
ID: 40333108
Any other ideas out here for this... I need to figure out why so much disk space is being taken up and what to do about it??
How can I delete things from the backups?
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Expert Comment

by:gheist
ID: 40333114
Dont expect backup size to reduce by deleting items. They are born with magnetic tapes in brain.
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Author Comment

by:vmich
ID: 40333124
I am confused in why I am using up almost 2TB of space when I am backing up vms with thie total disk size around 1.1TB
Should it not be deduping it to take up less space?
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Author Comment

by:vmich
ID: 40333205
The dedupe size is showing 1.8TB and the non dedup is 2.1TB
Should not the dedup be a lot smaller and using less space?
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Expert Comment

by:gheist
ID: 40333212
Dedupllication is incremental process. First you need to make room for a copy of VM disks i.e 1.1TB, then at scheduled deduplication it will be merged back with original data.
Sorry but I dont understand value of backup on same single storage unit...
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Author Comment

by:vmich
ID: 40333221
The san is in a different location than the vms are for dr..
I am not sure I understand what you are saying about the storage for the disk..
As I mentioned I set up the config with 2TB which sets up 1 100GB disk and then 3 1TB disk, which I thought would have been enough but it shows me that there is only 290GB free...
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Expert Comment

by:gheist
ID: 40333375
For any kind of deduplication to kick in you need to back up very duplicate data, e.g same system on and on again....
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Author Comment

by:vmich
ID: 40333494
can you explain that a little better what you mean..
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Accepted Solution

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gheist earned 500 total points
ID: 40333580
If data is unique (like single database disk backup) there is no deduplication possible.
Whan you backup same data again sure it deduplicates very well.
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Author Closing Comment

by:vmich
ID: 40352707
data dedup
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Expert Comment

by:gheist
ID: 40352881
yuo mean dup first then wait?
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Author Comment

by:vmich
ID: 40352895
yes that's it...
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Expert Comment

by:gheist
ID: 40353021
Cheers :)
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