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Dell PowerFlex v3.6.x CLI Reference Guide

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enable_background_device_scanner

Enable the background device scanner on the devices in the specified Storage Pool to check for errors (not supported in Fine Granularity Storage Pools).

Syntax

scli --enable_background_device_scanner (((--protection_domain_id <ID> | --protection_domain_name <NAME>) --storage_pool_name <NAME>) | --storage_pool_id <ID>) --read_error_action <ACTION>  --compare_error_action <ACTION>
  [--scanner_bandwidth_limit <LIMIT>]

Parameters

--protection_domain_id <ID>
Protection Domain ID
--protection_domain_name <NAME>
Protection Domain name
--storage_pool_name <NAME>
Storage Pool name
--storage_pool_id <ID>
Storage Pool ID
--read_error_action
Read error handling. Can be one of the following:
--report_and_fix
Perform read operations and automatically fix from peer on errors.
--report_only
Perform read operations and report errors without fixing them.
--compare_error_action
Compare error handling between primary and secondary copies of data.
NOTE:Zero padding must be enabled in order to set the background device scanner to data compare mode.
Can be one of the following:
--no_compare
Perform read operations without comparing data content with peer.
--report_and_fix
Perform read operations, compare data content with peer, and automatically fix.
--report_only
Perform read operations, compare data content with peer, and report mismatches without fixing them.
--scanner_bandwidth_limit <LIMIT>
Bandwidth limit in KB per second per device. The value should be in the range of 10 KB to 10 MB. Default: 3 MB.
NOTE:High bandwidth should be used very carefully for extreme cases only (such as an urgent need to check some devices), as it may create negative impact on the system performance. Setting the background device scanner bandwidth should take into account maximum bandwidth of the devices.
NOTE:If you use the storage_pool_id parameter in the command, you do not need to also specify the Protection Domain ID or name, and the Storage Pool name.

Example

scli --enable_background_device_scanner --protection_domain_name pd120 --storage_pool_name sp18 --read_error_action --report_only --compare_error_action --report_only --scanner_bandwidth_limit 2000

Errors

To check for errors detected by the background device scanner, query SDSs using the --query_sds command. Error information is provided in event reports. For more information about viewing events, see the Monitor Dell PowerFlex.

Bandwidth limits

High bandwidth may create negative impact on system performance and should be used carefully and in extreme cases only—for example, when there is an urgent need to check certain devices. When setting the background device scanner bandwidth, you should take into account the maximum bandwidth of the devices.

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