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Data Compression for VSA

By default, VSA proxies use LZO compression for storage policies created in V11 SP4 or later. Prior to SP4, VSA storage policies use GZIP compression.

 LZO compression usually provides better throughput than GZIP, but might result in slightly more data written on the disk.  GZIP provides a better compression ratio, but uses more CPU cycles.

  • To use LZO compression for storage policies created before V11 SP4, create the nCOMPRESSIONSCHEME additional setting on VSA proxies and set the value to 1.
  • To use GZIP compression for storage policies created in V11 SP4 or later, create the nCOMPRESSIONSCHEME additional setting on VSA proxies and set the value to 0.

After creating this additional setting, the specified compression method is used for the next full or incremental backup.

You can verify the compression settings that are actually used in the following logs:

  • CVD log (when old pipeline is used):

    Initializing ZIP compression scheme
    Initializing LZO compression scheme

  • Backup log (when SDT pipeline is used):

    Comp. scheme [%d]
    LZO init retVal [%d]. Spill buf size [%d] bytes
    gzip comp level set to [%d]

Last modified: 1/7/2018 8:41:39 PM