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Compression & Deduplication, how they work?

Hello,

 

We have an HyperFlex systems with 5 nodes HXAF240C-M5SX and 85TB of total storage with 56TB already in use. The storage optimization shows only 12%, so compression 10% and deduplication 2%. Normally I see more than 40% of optimization in training documents, videos, courses, etc, what is the problem in our installation? how we can optimize more the storage? how they work?

 

Thanks in advance,

 

Omar De Souza

 

2 Replies 2

Kirk J
Cisco Employee
Cisco Employee

Deduplication references objects at the datastore level.  If you have a lot of datastores, then you will see much lower deduplication rates.

Fewer datastores will generally result in better/higher deduplication rates.

The nature of guestVMs influences the compression ratio, just like some files 'zip' up really well, and some, hardly at all.

 

How many datastores do you have created?

 

Kirk...

Hi Kirk,

 

We have only 3 datastores of 20TB, 1 of 25TB and one of 200GB for ISO files.

 

Because all is VMware, in datastore there are only VMware files, likes vmdk's, etc, so deduplication works in these files? for example, if we have 20 Windows Servers 2019, with a similar C: drives, deduplication will analyze the blocks in these vmdk files? We have only 2% in the dedup ratio.

 

For the compression, we have 56TB used from a total of 85TB and only 10% of compression, so that means that HyperFlex cannot have a good compress ration in VMware files for their nature?

 

Thanks for your help.

 

Omar De Souza.

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