For more information, see Continuous Data Verification Scans and Priority Write Verify Scans.
Data Check performs an early write verify scan, also known as a namespace scan, when files are first created or when they are modified by users. All of the modified files are flagged for priority scanning and this process is based on its timestamp—with a higher priority given to the most recently modified files. Early write verify scans are performed every five minutes when the other DR Series system operations are idle. For more information, see About Data Check and 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 and Priority Write Verify Scans.
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.
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Display the current Data Check state (enabled/disabled status for namespace, blockmap, or all). For more information, see system --datacheck. |
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Enable Data Check scans (namespace, blockmap, or all). For more information, see system --datacheck [--enable <all | namespace | blockmap>]. |
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Disable Data Check scans (for namespace, blockmap, or all). For more information, see system --datacheck [--disable <all | namespace | blockmap>]. |
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