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High Availability and Data Protection with Dell PowerScale Scale-Out NAS
Executive summary High availability and reliability at the petabyte scale High availability with OneFS OneFS fault tolerance
File system journal
Protective device failure
Data integrity
Protocol checksums
Dynamic Sector Repair
MediaScan
IntegrityScan
Fault isolation
Accelerated drive rebuilds
Automatic drive firmware updates
Rolling upgrade
Nondisruptive upgrades
Parallel upgrades
Rollback capable
Performing the upgrade
Data protection
High availability and data protection strategies Summary OneFS glossary

Dynamic Sector Repair

Dynamic Sector Repair

  • OneFS includes a Dynamic Sector Repair (DSR) feature whereby the file system can force bad disk sectors to be rewritten elsewhere. When OneFS fails to read a block during normal operation, DSR is invoked to reconstruct the missing data and write it to either a different location on the drive or to another drive on the node. This is done to ensure that subsequent reads of the block do not fail. DSR is fully automated and transparent to the end user. Disk sector errors and Cyclic Redundancy Check (CRC) mismatches use almost the same mechanism as the drive rebuild process.