Add new zvol

This function allows You to create a new zvol. You have to fill up or choose detailed information related to zvol :

• NAME - Name the new Zvol
• SIZE - Size of new Zvol. The unit for this values is GiB (Gibibyte).

​In general, if You multiply 1024 ·1024 ·1024 = 1 073 741 824b, which is a result of eqaul 2^30.

For example, 1 GiB = 1024 × 1 MiB = 1024 × 1024 × 1 KiB = 1024 × 1024 × 1024 × 1 B = 1 073 741 824 ~ 1070 GB

• PROVISIONING - choose between the : thick provisioned and Thin provisioned (dafault).

• DEDUPLICATION - choose between :
  • ​Disbaled (dafault)
  • On - is simply a pseudonym for "sha256"
  • Verify - is a pseudonym for "sha256,verify", option that performs a full comparison of every incoming block with any alleged duplicate to ensure that they really are the same
  • sha 256 - performs a operation where same output given two different inputs, then it is reasonable to assume that when two blocks have the same checksum, they are in fact the same block.
  • sha 256, verify - enables an ability to detect and correct hash collisions, however this is very system intensive and is not recommended for casual use

• COMPRESSION - there are several data compression methods - You will see all available methods from the drop-down list. The default compression method is LZ4.You can also choose no compression (NONE).
  • GZIP, the standards levels of 1 through 9 are supported, where 1 is as fast as possible, with the least compression, and 9 is as compressed as possible, taking as much time as necessary.
  • LZJB -  is a fast method with tight compression ratios, which is standard with most Lempel-Ziv algorithms. LZJB seems to provide the best all around results it terms of performance and compression.
  • ZLE is a very fast compression method, with very light compression ratios.
  • lz4 - is intended as a faster and smarter replacement for lzjb.
• VOLUME BLOCK SIZE  - the default value is 64 KiB. The value can be changed. You can choose between : 0,5 ; 1; 2; 4; 8; 16; 32; 64; 128 [KiB].
• SYNC  - you can choose between three options :
  • always (default)
  • standard
  • disabled
• ​LOG BIAS - allows to setup between the latency (default) and throughput.
• PRIMARY CACHE - one of three options have to be chosen :
  • all (default)
  • none
  • metadata
• ​SECONDARY CACHE - one of three options have to be chosen :
  • all (default)
  • none
  • metadata
• ​COPIES - number of copies of the data.  As a default, it is set to 1.