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Command Reference

OceanStor 18000 and 18000F V5 Series V500R007

This document is applicable to OceanStor 18500 V5, 18800 V5, 18500F V5, and 18800F V5 storage systems. It describes hardware installation of those storage systems for helping you easily and quickly finish the installation.

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create lun_takeover general

create lun_takeover general


The create lun_takeover general command is used to create takeover LUNs.


create lun_takeover general type=? [ remote_lun_wwn_list=? name=? storage_pool_id=? write_policy=? [ prefetch_policy=? ] [ prefetch_multiple=? ] [ prefetch_value=? ] [ io_priority=? ] [ owner_controller=? ] [ lun_id=? ] [ dif_switch=? ] [ support_thinlun=? ] | edevlun_id=? | remote_device_id=? lun_id=? ]





type=? Type of the takeover logical unit number (LUN).

The value can be:

  • "BASIC": basic takeover LUN.
  • "EXTEND": expansion takeover LUN.
  • "INHERIT": inherited takeover LUN.
  • "THIRD-PARTY": third-party takeover LUN.
name=? Name of a LUN that you want to create.

The value contains 1 to 31 ASCII characters, including digits, letters, underscores (_), hyphens (-), and periods (.).

lun_id=? LUN ID. This parameter is mutually exclusive with edevlun_id=?. If the parameter edevlun_id=? is specified, this parameter is unavailable.

The value is an integer ranging from 0 to 65535.

The storage system automatically allocates an ID for a newly created LUN if this parameter will not be used.

To obtain the value, run "show lun general".

write_policy=? Cache write policy.

The value must be "write_through", where:

"write_through": indicates write through. The system considers that a data write is successful only after data is written to hard disks. Hard disks are accessed in each data write.

prefetch_policy=? Cache prefetch policy.

The value can be "none", "constant", "variable", or "intelligent", where:

  • "none": indicates non-prefetch.
  • "constant": indicates constant prefetch.
  • "variable": indicates variable prefetch.
  • "intelligent": indicates intelligent prefetch.
The default value is "intelligent".
prefetch_multiple=? Cache prefetch multiple. This parameter is required when prefetch_policy=? is set to "variable".

The value ranges from 0 to 1024.

prefetch_value=? Cache prefetch size. This parameter is required when prefetch_policy=? is set to "constant".

The value ranges from 0 to 1024, expressed in KB.

io_priority=? I/O priority of a LUN.

The value can be "Low", "Middle", or "High", where:

  • "Low": indicates the low priority.
  • "Middle": indicates the medium priority.
  • "High": indicates the high priority.
The default value is "Low".
owner_controller=? LUN owning controller.

The value is in the format of "XA", "XB", "XC", or "XD", where the "X" is an integer ranging from 0 to 3.

dif_switch=? Whether or not to enable the DIF function.

The value can be:

  • "Yes": The DIF function will be enabled.
  • "No": The DIF function will not be enabled.
remote_lun_wwn_list=? WWN of a remote LUN.
  • The WWN of the remote LUN consists of 1 to 32 characters, including digits ranging from 0 to 9, lowercase letters ranging from a to f, and uppercase letters ranging from A to F. For example, 6e4a8b6100b0a1cc0003c8c600000001. Two characters can be separated by colons (:). For example, 6e:4a:8b:61:00:b0:a1:cc:00:03:c8:c6:00:00:00:01.
  • You can enter 1 to 10 WWNs of remote LUNs separated by commas (,).
  • You can run the "show remote_lun general" command to obtain the WWN of the remote LUN.
storage_pool_id=? ID of the storage pool to which a LUN belongs.

To obtain the value, run the "show storage_pool general" command.

edevlun_id=? ID of the eDevLUN.

To obtain the value, run the "show lun general usage_type=External" command.

remote_device_id=? ID of a remote device.

To obtain the value, run "show remote_device general array_type=heterogeneity".

support_thinlun=? Whether to support thin LUNs.

The value can be "yes" or "no", where:

  • "yes": Thin LUNs are supported.
  • "no": Thin LUNs are not supported. If you select this value, a thick LUN is created by default.
The default value is "yes".



Usage Guidelines



Create a takeover LUN and set its parameters as follows:
  • Type of the specific takeover LUN: BASIC
  • ID of the eDevLUN: 0
admin:/>create lun_takeover general type=BASIC edevlun_id=0
Command executed successfully.

System Response


Updated: 2020-01-17

Document ID: EDOC1000181601

Views: 381821

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