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OceanStor 9000 V5 7.0 Command Reference 03

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change diskpool_databalance

change diskpool_databalance

Function

The change diskpool_databalance command is used to set the parameters of balanced capacity.

Format

change diskpool_databalance < enable > [ data_migration_threshold=? ] [ write_inhibit_threshold=? ] [ start_threshold=? ] [ stop_threshold=? ] [ urgent_start_threshold=? ] [ urgent_stop_threshold=? ]

Parameters

Parameter

Description

Value

enable Switch of data balancing.

The value is "true" or "false", where:

  • "true": to enable capacity balancing.
  • "false": to disable capacity balancing.
data_migration_threshold Data migration threshold in a DiskPool.

When the SSD pool capacity used by small file and metadata reaches the data migration threshold, small file is migrated from the DiskPool. The threshold ranges from 70% to 85%. The default threshold is 80%.

write_inhibit_threshold Threshold of writing inhibit threshold in a DiskPool.

When the SSD pool capacity used by small file and metadata reaches the write inhibit threshold, small file cannot be written to the DiskPool. The threshold ranges from 55% to 70%. The default threshold is 65%.

start_threshold Threshold of triggering data balancing across disk pools.

When the capacity usage discrepency of the disk pools on the same tier reaches this threshold, data dalancing is triggered. The value ranges between "10" and "40", and the default value is "20%".

stop_threshold Threshold of stopping data balancing across disk pools.

When the capacity usage discrepency of the disk pools on the same tier falls below this threshold, data dalancing is stopped. The value ranges between "5" and 25%", and the default value is "10%". Make sure that "start_threshold" is larger than "stop_threshold"+5%.

urgent_start_threshold Threshold of triggering data balancing across disk pools in an emergence.

For the disk pools on the same tier, if the capacity usage for some disk pools have reached the "Read-only threshold" and that for others has not, data balancing is triggered when the capacity usage difference exceeds this threshold. The value ranges between "5%" and "20%", and the default value is "5%".

urgent_stop_threshold Threshold of stopping data balancing across disk pools in an emergence.

For the disk pools on the same tier, after the capacity usage of some disk pools falls below the "read-only" threshold, if the capacity usage difference between these disk pool and other disk pools whose capacity usage is always below the "read-only threshold" falls below this threshold, data balancing is stopped. The value ranges between "2%" and 5%", and the default value is "2%". Make sure that "urgent_start_threshold" is larger than "urgent_stop_threshold"+3%.

Level

Administrator

Usage Guidelines

None

Example

Set the parameters of balanced capacity.

admin:/>change diskpool_databalance true data_migration_threshold=70 write_inhibit_threshold=60 start_threshold=40 stop_threshold=5 urgent_start_threshold=20 urgent_stop_threshold=5
Command executed successfully.

System Response

None

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Updated: 2019-05-07

Document ID: EDOC1100067955

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