Continuous Data Verification Scans; Data Check Cli Commands; Data Check Options - Dell PowerVault Storage Area Network Reference Manual

five minutes when the other DR Series system operations are idle. For more information, see
Continuous Data Verification

Continuous Data Verification Scans

Data Check performs a data verification scan, also known as a blockmap scan, which cycles every two hours through all
of the objects in the data store. Data integrity verification is done by recalculating the hash values for the underlying
data, and comparing these to the stored hash values using an additional checksum process. Any unexpected data
inconsistencies are reported using the DR Series system alerts process.
For more information, see About Data Check

Data Check CLI Commands

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
• Enable Data Check scans (namespace, blockmap, or all). For more information, see
enable <all | namespace |
• Disable Data Check scans (for namespace, blockmap, or all). For more information, see
disable <all | namespace |
• Set the percentage of available system resources to use for Data Check scans. For more information, see
system --datacheck [--throttle
• 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
stats --datacheck Commands
• Display the variety of Data Check statistics collected by the DR4000 system. For more information, see
datacheck.
• Reset the Data Check statistics in the DR4000 system. For more information, see
• 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

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.
122
Scans.
and Priority Write Verify
--datacheck.
blockmap>].
blockmap>].
<1-100>].
datacheck.
stats --help datacheck.
About Data Check
Scans.
system --datacheck [--
system --datacheck [--
stats --reset
and
stats --
--datacheck.