|
five minutes when the other DR Series system operations are idle. For more information, see About Data Check andContinuous Data Verification Scans.Continuous Data Verification ScansData Check performs a data verification scan, also known as a blockmap scan, which cycles every two hours through allof the objects in the data store. Data integrity verification is done by recalculating the hash values for the underlyingdata, and comparing these to the stored hash values using an additional checksum process. Any unexpected datainconsistencies are reported using the DR Series system alerts process.For more information, see About Data Check and Priority Write Verify Scans.Data Check CLI CommandsThese DR Series system CLI commands allow you to perform the following Data Check-related scans and displaycurrent 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 moreinformation, see system --datacheck.• Enable Data Check scans (namespace, blockmap, or all). For more information, see system --datacheck [--enable ].• Disable Data Check scans (for namespace, blockmap, or all). For more information, see system --datacheck [--disable ].• Set the percentage of available system resources to use for Data Check scans. For more information, seesystem --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 moreinformation, 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 systemCLI. For more information, see stats --help datacheck.Data Check OptionsData Check performs data integrity checks that detect potential silent data inconsistencies that can affect the systemdisks or disk subsystems, and protect user data. Data Check provides the following options that can be set for DR Seriessystem 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 areenabled.122
|
