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Advanced O&M Command Reference

OceanStor 2000, 5000, and 6000 V3 Series V300R006

This document is applicable to OceanStor 2200 V3, 2600 V3 Video Surveillance Edition, 2600 V3, 5300 V3, 5500 V3, 5600 V3, 5800 V3, and 6800 V3. Based on the CLI, 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. The document that you browse online matches the latest C version of the product. Click Download to download documents of other C versions.
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change hyper_metro_pair write_mode

change hyper_metro_pair write_mode


The change hyper_metro_pair write_mode command is used to set the write mode of a HyperMetro pair to tune the performance of HyperMetro IO lock.


change hyper_metro_pair write_mode pair_id=? write_mode=? [ prefetch_mode=? | prefetch_size=? ]






ID of the HyperMetro pair.

Run the "show hyper_metro_pair general" command without any parameters to obtain the value.


Write mode of host.

The value is "none" or "sequential" or "reverse" or "random", where:

  • "none": none I/O write mode.
  • "sequential": sequential I/O write mode.
  • "reverse": reverse I/O write mode.
  • "random": random I/O write mode.


Prefetch mode.

The value is "max" or "scale" or "block_kb" or "block_mb" or "block_gb", where:

  • "max": max prefetch size,only for "sequential" and "reverse" write mode.
  • "scale": prefetch by a scale of io size.
  • "block_kb": prefetch by a fixed size in KB.
  • "block_mb": prefetch by a fixed size in MB.
  • "block_gb": prefetch by a fixed size in GB.


Prefetch size.



Developer view, Engineer view

Usage Guidelines

OceanStor 2100 V3/6800 V3/2600 V3/5300 V3/5500 V3/5600 V3/5800 V3 storage systems support this command.


Set write mode as random, and the max prefetch size is 64 KB for a HyperMetro pair whose ID is "1".

engineer:/>change hyper_metro_pair write_mode pair_id=1 write_mode=random prefetch_mode=block_kb prefetch_size=64 
Command executed successfully.

System Response


Updated: 2019-07-12

Document ID: EDOC1000138402

Views: 635060

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