Enabling Block Storage

This section describes common operations on the compression algorithm in block storage scenarios.

• Enable the compression algorithm.

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  ceph osd pool create vdbench 1024 1024 ceph osd pool set vdbench compression_algorithm glz ceph osd pool set vdbench compression_mode force

• Set the compression ratio of the algorithm.

  1	ceph osd pool set vdbench compression_required_ratio .99

• Modify the compression algorithm level.
  

  The compression algorithm supports two levels: 0 and 1. Level 0 indicates the high-performance mode, whereas level 1 indicates the high-compression mode.

  1. Edit the ceph.conf file.

     1	vi /etc/ceph/ceph.conf

  2. Change the value of compressor_glz_level.
     

     By default, compressor_glz_level is set to 0 on Ceph. If the high-performance mode is used, retain the default settings. If the high-compression mode is used, change the value to 1 as follows:

     1	compressor_glz_level = 1

     

  3. Restart the OSD node for the modification to take effect.

     1	systemctl restart ceph-osd.target