Which type of compression can help to do more compress and dedup

Hello virtualcdc,

For your DD9900 it depends on the type of data that is needed to be compressed. The default compression for a DD9900 is gzfast. Most customers that I have worked with in regards to compression use gz.

@DELL-Sam L​ 

Thanks.

Actually I found follow recommendation : 
In general, LZ compression typically offers the best compression ratios, followed by gzfast and then gz. However, LZ compression also requires more CPU resources and processing time compared to gzfast or gz.

So I set it on LZ. Does it mean LZ has best compression rate or gz ?

Hello virtualcdc,

It really comes down to the type of data that you are compressing. GZ does have a better rate on paper than LZ, but as stated before it depends on the type of data, as I have seen LZ preform better in most cases.

@DELL-Sam L​ 

Actually most of my data type is veeam backup from VMS and oracle dump files

@DELL-Sam L​ 

Most of my data type is by DD-Boost and virtualization . Which type is best . Which one has more rate for dedup and compression ? 

GZ , LZ , GZFAST ?

Hello virtualcdc,

If your environment can handle the high cpu utilization then, GZ is the compression type I would use. If you are concerned about cpu utilization then, I would use gzfast. I am unaware of your environment so it is hard for me to make an accurate assessment.

@DELL-Sam L​ 

Thanks. Does it mean LZ type is not recommendation ?

Hello virtualcdc,

LZ is recommend/ default compression. A customer can choose a different compression type, if their environment can handle the more cpu utilization.

@DELL-Sam L​ 

Does it means LZ can do more compression rate between all type of compression methods and just use more cpu or gz can do better compression ?

Hello virtualcdc,

GZ can do a better compression than LZ can.

@DELL-Sam L​ 

So thanks. I found follow doc on emc  :  

In general the order of compression is as follows:

https://www.dell.com/support/kbdoc/en-us/000022100/1470-compression-faq

The rough difference is:

• lz to gzfast gives ~15% better compression and consumes 2x CPU
• lz to gz gives ~30% better compression and consumes 5x CPU
• gzfast to gz gives ~10-15% better compression

So according to that LZ hast best compression rate . Is that correct ?

Hello virtualcdc,

That is correct, that LZ in most cases has the best compression rate.