DR Series Software 4.0.4 - Command Line Reference Guide

These DR Series system CLI commands allow you to perform the following Data Check-related scans and display current Data Check status. There are two sets of Data Check related DR Series system CLI commands: system --datacheck and stats --datacheck.

system --datacheck Commands

Display the current Data Check state (enabled/disabled status for namespace, blockmap, or all). For more information, see system --datacheck.
Enable Data Check scans (namespace, blockmap, or all). For more information, see system --datacheck [--enable <all | namespace | blockmap>].
Disable Data Check scans (for namespace, blockmap, or all). For more information, see system --datacheck [--disable <all | namespace | blockmap>].
Set the percentage of available system resources to use for Data Check scans. For more information, see system --datacheck [--throttle <1-100>].
Display the list of Data Check help-related options that can be used as a reference when using the CLI. For more information, see system --help datacheck.

stats --datacheck Commands

Display the variety of Data Check statistics collected by the DR4000 system. For more information, see stats --datacheck.
Reset the Data Check statistics in the DR4000 system. For more information, see stats --reset --datacheck.
Display the list of Data Check-related options that can be used as a reference when using the DR Series system CLI. For more information, see stats --help datacheck.

Data Check Options

Data Check performs data integrity checks that detect potential silent data inconsistencies that can affect the system disks or disk subsystems, and protect user data. Data Check provides the following options that can be set for DR Series system data scan operations:

Namespace (system --datacheck --enable namespace).
Blockmap (system --datacheck --enable blockmap).
All (system --datacheck --enable all); this is the default setting where both namespace and blockmap are enabled.

Data Check: Namespace Scan Option

The namespace scan option focuses on file attributes such as file size, file name, permissions, and last time modified. Data integrity verification is done using a checksum process. You can choose to enable or disable the Data Check namespace scan in the DR Series system based on the command setting you select.

Data Check: Blockmap Scan Option

The blockmap scan option identifies a specific mapping of data contained within a block, with a block being a structured form of data that the DR Series system can identify. You can choose to enable or disable the Data Check blockmap scan based on the command option you select.

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