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Command Reference for Block

OceanStor Dorado V3 Series V300R002

This document is applicable to OceanStor Dorado3000 V3, Dorado5000 V3, Dorado6000 V3 and Dorado18000 V3. Based on the CLI provided by the DeviceManager, this document describes how to use various commands classified by functions and how to set the CLI and manage the storage system through these commands.
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create consistency_group asynchronization

create consistency_group asynchronization

Function

The create consistency_group asynchronization command is used to create asynchronous consistency groups. You can centrally manage multiple asynchronous remote replication tasks by running this command.

Format

create consistency_group asynchronization name=? [ compress_enable=? | recovery_policy=? | synchronization_rate=? | synchronization_type=? [ timing_length=? timing_unit=? ] [ replication_type=? ] ] *

Parameters

Parameter

Description

Value

name=?

Name of a consistency group.

The value contains 1 to 31 ASCII characters including digits, letters, hyphens (-), underscores (_), and periods (.), and can only start with a digit or a letter.

compress_enable=?

Whether to enable compression.

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

  • "yes": enables compression.
  • "no": disables compression.

recovery_policy=?

Link recovery policy. This parameter defines a policy for recovering the links that were unexpectedly disconnected for the remote replication tasks in a consistency group.

The value can be:

  • "automatic": When links are recovered, the remote replication tasks in the consistency group are resumed automatically.
  • "manual": When links are recovered, the remote replication tasks in the consistency group need to be resumed manually. The consistency group retains the state preserved at the time when links are interrupted, and does not resume the interrupted remote replication tasks automatically.

The default value is "automatic".

synchronization_rate=?

Synchronization rate.

The value can be:

  • "Low": 0 to 5 MB/s. This speed applies to scenarios where the service load is very heavy.
  • "Middle": 5 to 20 MB/s. For Dorado3000 V3, the value is from 5 to 10 MB/s. For others, the value is from 10 to 20 MB/s. This speed is applied when system service load is relatively heavy.
  • "High": 10 to 70 MB/s. For Dorado3000 V3, the value is from 10 to 20 MB/s. For Dorado5000 V3 (SAS), the value is from 20 to 35 MB/s. For Dorado5000 V3 (NVMe), Dorado6000 V3, and Dorado18000 V3, the value is from 50 to 70 MB/s. This speed applies to scenarios where the service load is relatively light.
  • "Highest": more than 100 MB/s. This speed applies to scenarios where the service load is light.

The default value is "Middle".

synchronization_type=?

Synchronization type.

The value can be:

  • "manual": Data needs to be synchronized manually.
  • "timed_wait_when_synchronization_begins": When a data synchronization job is started, the storage system waits for a period specified by the synchronization interval before implementing the next synchronization job.
  • "timed_wait_when_synchronization_ends": When a data synchronization job is completed, the storage system waits for a period specified by the synchronization interval before implementing the next synchronization job.

The default value is "manual".

timing_length=?

Synchronization interval. This parameter is valid only when synchronization_type=? is set to "timed_wait_when_synchronization_begins" or "timed_wait_when_synchronization_ends".

  • The value ranges from 1 to 1440, expressed in minutes.
  • The value ranges from 10 to 59, expressed in seconds.
  • The default value is "60 minutes".

timing_unit=?

Unit of the synchronization period.

The value can be:

  • "minute": indicates minutes.
  • "second": indicates seconds.

replication_type=?

Type of the consistency group.

The value can be:

  • "comm": common consistency group.
  • "cloud": cloud-based consistency group.

Level

Administrator

Usage Guidelines

  • An asynchronous consistency group can only contain asynchronous instead of synchronous remote replication tasks.
  • For an asynchronous remote replication task, a host will be informed that the write request has been successfully responded as long as writing the primary logical unit number (LUN) has succeeded. After the host has been informed that the write request had succeeded, the storage system synchronizes the primary LUN with a secondary LUN either by manual synchronization triggering or by automated system triggering. This replication mode features relatively high responsiveness to write requests but suffers from potential data inconsistency between the primary and secondary LUNs.

Example

  • Create an asynchronous consistency group, where the name of the consistency group is "efg", the synchronization rate is middle, and the recovery policy is automatic.
    admin:/>create consistency_group asynchronization name=efg synchronization_rate=middle recovery_policy=automatic 
    Command executed successfully.
  • Create an asynchronous consistency group, where the name of the consistency group is "efg", the synchronization rate is "Highest", and the recovery policy is automatic.
    admin:/>create consistency_group asynchronization name=efg synchronization_rate=Highest 
    WARNING: You are about to select the highest synchronization speed to create a remote replication consistency group. 
    After the operation, data of remote replication pairs in the consistency group will be synchronized at the highest speed. As a result, the host latency may increase and the synchronization relationships of remote replication pairs in the consistency group may be interrupted. 
    Suggestion: Select a lower synchronization speed. If you select the highest speed, check the capabilities of the local and remote devices and the replication link bandwidth. You are advised to select the highest synchronization speed to create a remote replication consistency group during off-peak hours. 
    Have you read danger alert message carefully?(y/n)y 
    Are you sure you really want to perform the operation?(y/n)y 
    Command executed successfully.

System Response

None

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Updated: 2019-07-16

Document ID: EDOC1100049140

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